Archive for the ‘dynaco’ Category

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Wednesday, November 24th, 2021
Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W

No mid-fi, no gimmicks, no junk. Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Project, and Sony ES, we have access to OEM parts, service, and support. This listing is for a working set of Mark VI Monoblocks in working condition. Features rare XLR inputs for an amplifier this age. Cool bias meter on the front with rack handles. This pair of amplifiers is labeled “Dynaco Wired”, however they have underwent a significant modification at some point in the past. The majority of the electrolytic capacitors were replaced, film bypass capacitors were added to the various power supply rails, and slow start relay circuits were added to delay the B+ voltages. Other modifications may have been performed that we are unaware of that sharp Dynaco aficionados may recognize. Both amplifiers were tested to their rated power of 120W. Both meter lamps and meters are working properly. Tubes include RCA 7199, and a mix Sylvania and Philips USA 8417. Please see our pictures for overall condition. The Mark VI is a vacuum tube high power basic power amplifier designed for the professional sound installer. Vacuum tubes are most often favored in their ability to withstand enormous physical and electrical abuse – conditions frequently encountered in discotheques, public address and musical instrument applications. Its rugged construction and utilization of superior components, including the patented Dynaco Super Fidelity transformers, permit continuous duty at full power, while maintaining safe operating margins. Protective isolation of the load from the driving circuits, and uniform power output into a variety of load impedances are inherent in all designs which use an impedance matching transformer. The Mark VI employs a basic circuit arrangement which all Dynaco vacuum tube amplifiers have used since the inception of the Mark II amplifier in 1955. Refinements of the operating parameters have been incorporated for circuit balance, stability, and for drive capability. The components used have been selected to protect against failure, and all parts are operated conservatively to assure superior performance and proper operation for many years. The SkyFi Testing Process for Tube Amplifiers. We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and tubes are inspected for signs of stress overheating or cracking. We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If it all looks clean we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier the remains powered on to “burn in” on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will also be tested. We also test all tubes for output gain and leakage on our calibrated modern and professional tube tester against the original manufacturers specifications. If needed, the tubes will be replaced from our vast NOS (New Old Stock) vintage or modern inventory. Final testing involves pushing actual music thorough the amplifier. We’ve learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we’re very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice. 120 watts into 8 (mono). 10 Hz to 40 kHz. Signal to noise ratio. 4 x 8417, 1 x 7199. 19 x 10.5 x 8.75 inches. We have too many items for sale and its nearly impossible to keep track of offers outside of the official system. We accept trade-ins of equal or lesser value under certain conditions. Please visit our website to submit your gear for full consideration. We will only consider high-end equipment from mainstream manufacturers such as McIntosh, Mark Levinson, Audio Research, Krell, etc. And will typically pass on displays, projectors, receivers, dated surround processors, and mid-fi equipment of any type. We will offer a fair value for your equipment, but keep in mind were running a business and will need to be able to resell the equipment at a profit after investing a great deal of time and resources in testing, certifying, repairing, cleaning, and packaging the incoming equipment. SELL US YOUR GEAR (Working or Broken). Simply visit our website to submit your gear for full consideration. We are currently operating from our shop inside our dedicated building in Glen Rock, NJ. We have several well-equipped and dedicated listening areas, plus a dedicated listening studio with tons of equipment of all makes and models. Were not a store, so please dont make an appointment if youre just curious as to how a speaker or piece of equipment sounds. In essence – no tire kickers please. This is super useful when purchasing large speakers or heavy amplifiers. Its also great for ensuring your new turntable is setup correctly in its final resting place. The item “Dynaco Mark VI Vintage Monoblock Tube Amplifier Pair, 120W” is in sale since Tuesday, November 16, 2021. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “skyfiaudio” and is located in Glen Rock, New Jersey. This item can be shipped to United States.
  • Brand: Dynaco
  • Type: Tube Amplifier
  • MPN: Mark VI
  • Model: Mark VI
  • Country/Region of Manufacture: United States

Dynaco St 70 Vacuum Tube Power Amplifier One Of The Best Vintage Stereo Components Of All Time

Tuesday, November 9th, 2021

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Friday, July 9th, 2021
Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34

Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34. This item is in Very Good Refurbished condition. Some dust on the cover. No rust, flaking on the chrome. There is a number scratched in the right corner 19637 All point to point wire was replaced with silver wire, Ceramic Tube sockets. All electrolytic caps were replaced about 1 years ago. This item is fully tested and working. The International EL-34s only have about 30 hrs on them. Tubes will be packed separately. We try to always provide accurate descriptions and explanations. The item in the photograph is the one you will receive, unless it is clearly stated above that this is a stock, or representative photograph. Please reach out if you have any questions. We will try to answer them a quickly as possible. We will absolutely make a mistake or two along the way. It is my deepest wish that it does not happen with this item. We will always make it right. We sell both consignment and store owned products. We are proud of the work that we do and think that you will be as well. 1873 Brookdale Dr COLORADO SPRINGS, CO 80918 Telephone. We often sell items for our friends and family as well. Has used its best efforts to inspect the item(s) for sale and create descriptions and furnish photographs that fairly and adequately depict the type, condition and image of the goods at the time of sale. This Listing Powered By. The item “Dynaco Stereo 70 Series EL-34 Tube Amplifier Vintage ST70 Dynakit Silver EL34″ is in sale since Thursday, June 3, 2021. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “weboog-13″ and is located in Colorado Springs, Colorado. This item can be shipped worldwide.
  • Brand: Dynaco
  • Model: Stereo 70
  • Modification Description: New Caps, Silver Wire, Modern Speaker Terminals
  • Modified Item: Yes
  • Type: Tube Amplifier
  • UPC: Does Not Apply

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Sunday, February 21st, 2021
Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

NEW Dynaco 70 / Dynakit Stereo 70. This Listing is for. Custom Built by Funtastic Vintronics. These are brand new amps with new tubes – 100% – not a rebuild or a restoration. Made and hand assembled in the. One at a time. Mundorf MCap ZN Capacitors – 600v – 5% – Values are increased to. 1uf for Improved Bass Response. (2) tested and matched Vintage NOS 6GH8A Tubes – Premium Brands like GE, Sylvania, RCA etc. (4) New EL34 Nesstone. Plate Current Matched – Amazing Sound. (1) New GT 5AR4 / GZ34 Rectifier Tube – Provides a Soft Start – High Current Capability. 1% Accuracy Ultra Low Noise. 500v Rated Resistors by PRP – made specifically for Audio use. 70 Watts Total Output – 35 Watts Per Channel – Pure Clean Real Analog Power. Genuine Dynakit PC-3 “B” Circuit Board – Made Specifically for 6GH8A/6U8A Driver Tubes – No tube Adapters here. Bias Circuit uses (2) 100uf 100V Capacitors with Flameproof Metal Oxide Resistors. Dynakit PA-060 Power Transformer (120v Windings) – Notice its Size, the Increased Lamination Stack! Dynakit A-470 Output Transformers – (4,8,16 Ohm Taps) – Grain Oriented Laminations – Interleave Wound. Dynakit C-354 Shielded Power Supply Filter Choke – (1.75 Henries, 62 Ohms, 10%) – No Nasty Leaks. 9 Brand New High Quality Black Tube Sockets. 600v & 1000v Solid Core and Stranded Wiring Used Throughout the Entire Amp. Genuine Dynakit Multi Section Filter Capacitor – Factory Correct Values 80/40/30/20uf – 525v Rated. New Dynakit Stainless Steel Mirror Finish Chassis (Non-Magnetic) – Beautiful Museum Quality Look. Brand New Dynakit Perforated Steel Cover w/ matching badge. Power Supply has Diode Rectification. Flashback Prevention Safety Diodes Installed at the Rectifier Tube. Additional shielding on under chassis components to reduce EMI / interference. Careful wire routing to reduce movement & electromagnetic signal interference (EMI). Assembled With Alpha Fry 60/40 rosin core solder – for the Very Best Quality Connections. Power Transformer Isolation Bushings Installed – Prevents the Transfer of Mechanical Hum to the Chassis. Custom Silver RCA Input Jacks – Slightly Wider Spacing allows for Larger Modern Input Cables. Original Screw Style Speaker Output Terminals – Vintage Correct – Full Function (4,8,16 Ohm + Common/Ground). Heavy Duty Rubber Feet with Steel Bushings. Assembled with Great Attention to Detail Using High Quality Parts – 48 hr Minimum Burn in Tested – Sounds Incredible. Operates From a Standard Wall Outlet – No Voltage Reducer or Variac Needed – Built for Today’s 120v+ Voltages. Arrives With Bias Preset. Just Install the Tubes – Simple To Do – Instructions are Included. Front Preamp Sockets are Wired for Bias Set Only – Reduces Audio Signal Interference. The photos shown here are of several different amplifiers, meant to provide an example of the units offered for sale. Yours will look like the ones in these photos. Some pictures may show different brands of tubes. The tubes that are included are described in this listing. A Vintage Vibe with Modern Reliability. So how does it sound? Very musical with a highly detailed imaging & voice and plenty of solid, clean wonderful bass. This amp is absolutely dead quiet – no hum, no buzz, no hiss, no snap-crackle-pop! It sounds like it is supposed to. If you’re in search of that golden age of audio sound with stunning vintage looks, you’ve just found it. This is your bad boy. This is a 100% brand new amp, a very high quality build, total listening satisfaction. This ST-70 delivers dramatically improved sonics as the result of being carefully and thoughtfully built, all new, from the ground up, with technologically advanced components and all high-end parts. Is used with only a couple of re-engineered elements on the PCB solder traces to accommodate the 6GH8A tubes without having to use an adapter. Enjoy the rich smooth tones of analog audio and even order harmonics that only vacuum tube amplification can produce. It reveals musical qualities with fantastic realism and depth you may have never imagined possible. The legendary original design up to date with highly improved levels of sound quality, looks and performance. Because of the ST-70′s naturally high impedance (470K) it is compatible with virtually any solid state or tube preamp. This amplifier puts out 70 watts total, 35 watts per channel. It is fairly safe to say that most people today would have no idea of how wonderful a Stereo 70 amplifier is capable of sounding like. “Original condition” amps or those “updated” or having any number of “modifications” from mild to wild can still leave a lot to be desired. “Restored” is more than popping in a few capacitors and some tubes. Much more will need to be done to fully bring about that great sound the amp once had. Although they will play music, they are still incapable of reproducing the sound quality they possessed when new, 50 years ago unless they are fully restored. Resistors become noisy and drift out of tolerance due to age and heat. Circuit board and component materials begin to deteriorate causing signal degradation, solder joints and tube sockets can be loose, oxidized, worn and have poor quality connections causing signal interference and noise. Capacitors lose their range and clarity, their values having changed with time. Hiss, buzz, hum, pop and fuzziness are not normal or desirable qualities. Isn’t the great smooth sound of a time long gone by what you’re really after, those sweet tones produced only from tube amplification? Like a musical time machine, this amplifier will take you back to the beginning, like when these amps were new. But there’s even more to consider here. All of the components used in this amplifier have greatly improved characteristics over the ones available and used 50 years ago. That makes the sound quality of this amp even better than one would have been then, as a new one 50 years ago. Take a good close look at this one. Don’t cheat yourself out of what you’re really wanting; superb sound, high build quality, safe and reliable operation, great looks and that comforting pride of ownership. Pay particular attention to the size (height) of the power transformer on this amp (the middle one). Transformers are the heart and soul of a tube amp, period. Dynaco wasn’t messing around when they designed and built their originals. Notice how tall this new Dynakit transformer is compared to the original Dynaco PA060 power transformer. This is a real case of bigger is better. These new Dynakit transformers were reverse engineered from the original Dynaco designs using modern technologies and insulations. An increased lamination stack on this power transformer allows it to run cooler and provide better regulation. These transformers wont buzz or hum like the originals often do either. A major factor to consider here too is that the original transformers were designed to run from yesterday’s 117 Volt household current. Today’s household current is often 125 Volts or more so the use of a “step down” or “bucking” transformer is necessary to retard the voltage down to a safe operating level for amps having the original transformers. The new transformers are made for today’s higher household currents or VAC (Voltage). These transformers can be operated directly from your household outlets without secondary devices needed to reduce the voltage. These are USA made transformers that meet and exceed every aspect of the originals. If there were some sort of “magic” in the use of cloth leads, Dynakit would have certainly insisted on using them again. There’s simply no magic in cloth covered lead wire, period, it is inferior. In any comparison, these new transformers are just better than those old originals. Modern advancements in materials, methods and technologies used in the production of these transformers has resulted in superb transformers that operate quieter and cooler than the originals while providing less distortion, more power with increased reliability. The new A470 output transformers are also greatly improved, like the power transformer. The output transformers are interleaved/layer-wound and incorporate high quality M-6 grain oriented laminations. These also use better quality wire with better insulation, the primary is wound the same as the original A470 using the same number of turns on the same number of sections. These are made using the same patented Dynaco winding method, and made on the same core size and material type as the originals. These transformers are in one word, exceptional. I have selected the Groove Tubes 5AR4/GZ34 as the rectifier tube in my Dynaco 70′s for more than 2 years now. It has the highest current capability and has been 100% reliable, it also looks right at home in the amp. I believe it to be the best current production rectifier tube of its type on today’s market. Same story for the NessTone EL34/6CA7 tubes, they’re all I use now. These output tubes are hand selected and tested here in the USA and then identically matched as a quad (4 tubes) by their plate current test. Results using the ROE computerized testing system. I have had nothing but satisfied buyers and zero failures, they sound amazing. This amp also comes with 2 NOS Mullard or Amperex (as requested) 6GH8A tubes, tested and matched. The 6GH8A like the 7199 tube is a vacuum tube combining both a pentode and triode in a single glass envelope. Each section has a separate cathode and is electrically independent, the pentode is used for the input stage, and the triode as a phase inverter. The Dynaco ST-70 Series II came from the factory with a 6GH8A driver board and tubes. According to Dynaco published research and literature the 6GH8A tube actually outperformed the 7199! I also offer this amp in a 7199 version, identical in build with the exception of the 7199 driver board and tubes. The photos show the ST-70 using the updated Dynakit PC-3 board made for 6GH8A tubes. Amplifier makers like HH Scott, Harman Kardon and Eico, among others, have used the 6GH8A since back in the late 50′s. I honestly find no audible difference in the 7199 and the 6GH8A so long as both tubes are of equal quality. Good quality tubes are essential for the overall sound quality simply because they are a part of the circuit, the circuit can only sound as good as it’s parts will allow. Good circuit design is critical, the Dynaco circuit is genius. The 6GH8A, also no longer in production, appears to be in abundant supply and is very affordable. Like all tubes, some brands and build styles offer both sonic and reliability advantages over cheaper, inferior made tubes. This amp comes with. 2 NOS Mullard or Amperex (as requested). 6GH8A tubes, tested and matched. Tube installation instructions with a numbered easy to follow pictorial is included. Bias will be pre-set but due to variations in AC wall voltages the bias should be checked and adjusted as necessary for your specific location. Proper bias is essential for best sound quality and performance of the amplifier. Proper bias is also key to getting the most life out of your tubes. You are responsible for proper bias adjustment and maintenance, you will need a voltmeter that measures/reads DC volts and a small slot head screwdriver to turn the adjusters and to remove and reinstall the amplifiers cover. Bias should be set to 1.56 volts DC. Each unit is custom, a hand built, made to order unit. Your unit will look identical but wire color and routing may be slightly different from unit to unit, these are hand built units. Turnaround time is running 4-5 weeks right now. The manual with instructions, pictorials, diagrams, schematics and supplemental documentation is included. The item “Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp” is in sale since Saturday, February 6, 2021. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “funtasticvintronics” and is located in Coweta, Oklahoma. This item can be shipped to United States.
  • Model: Dynakit Stereo 70 / ST-70
  • Modified Item: No
  • Country/Region of Manufacture: United States
  • Custom Bundle: Yes
  • Included Tubes: (2) 6GH8A – (4) EL34 / 6CA7 – (1) 5AR4 / GZ34
  • Type: Tube Amplifier
  • MPN: DYNAKIT Stereo 70 / ST-70
  • Brand: Dynaco
  • Bundle Description: fully assembled amplifier with cover and all new tubes

The Dynaco Dynakit St70 Stereo Amplifier Restoration Project Part 1

Friday, January 15th, 2021

Dynaco Vintage Dynakit Stereo -70 Vacuum tube amps has Cage and Power Cord

Tuesday, January 12th, 2021
Dynaco Vintage Dynakit Stereo -70 Vacuum tube amps has Cage and Power Cord

Dynaco Vintage Dynakit Stereo -70 Vacuum tube amps has Cage and Power Cord

Dynaco Vintage Dynakit Stereo -70 Vacuum tube amps has Cage and Power Cord

Has Russian made el34 1049&1040&105. Dynakit Stereo 70 / ST-70. Includes Cage and Power Cord. It’s kinda heavy (obviously). The item “Dynaco Vintage Dynakit Stereo -70 Vacuum tube amps has Cage and Power Cord” is in sale since Friday, January 1, 2021. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “goodfightx” and is located in New York, New York. This item can’t be shipped, the buyer must pick up the item.
  • Brand: Dynaco
  • Type: Tube Amplifier

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

Thursday, January 7th, 2021
NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage

NEW Dynaco 70 / Dynakit Stereo 70. This Listing is for. Custom Built by Funtastic Vintronics. These are brand new amps – 100% – not a rebuild or a restoration. Made and assembled in the. Mundorf MCap ZN Capacitors – 600v – 5% – Values are increased to. 1uf for Improved Bass Response. 1% Accuracy Ultra Low Noise. 500v Rated Resistors by PRP – made specifically for Audio use. 70 Watts Total Output – 35 Watts Per Channel – Pure Clean Real Analog Power. Genuine Dynakit PC-3 “B” Circuit Board – Made Specifically for 6GH8A Driver Tubes – No tube Adapters here. Includes (2) tested and matched Vintage NOS 6GH8A Tubes by Amperex. Includes (4) New EL34 / 6CA7 NessTone Output Tubes – Plate Current Matched – Amazing Sound. Includes (1) New 5AR4 / GZ34 Rectifier Tube – Groove Tubes Label – Soft Start – High Current Capability. Bias Circuit uses (2) 100uf 100V Capacitors with Flameproof Metal Oxide Resistors. Dynakit PA-060 Power Transformer (120v Windings) – Notice its Size, the Increased Lamination Stack! Dynakit A-470 Output Transformers – (4,8,16 Ohm Taps) – Grain Oriented Laminations – Interleave Wound. Dynakit C-354 Shielded Power Supply Filter Choke – (1.75 Henries, 62 Ohms, 10%) – No Nasty Leaks. 9 Brand New High Quality Black Tube Sockets. 600v & 1000v Solid Core and Stranded Wiring Used Throughout the Entire Amp. Genuine Dynakit Multi Section Filter Capacitor – Factory Correct Values 80/40/30/20uf – 525v Rated. New Dynakit Stainless Steel Mirror Finish Chassis (Non-Magnetic) – Beautiful Museum Quality Look. Brand New Dynakit Perforated Steel Cover w/ matching badge. Power Supply has Diode Rectification. Flashback Prevention Safety Diodes Installed at the Rectifier Tube. Additional shielding on under chassis components to reduce EMI / interference. Careful wire routing to reduce movement & electromagnetic signal interference (EMI). Assembled With Alpha Fry 60/40 rosin core solder – for the Very Best Quality Connections. Power Transformer Isolation Bushings Installed – Prevents the Transfer of Mechanical Hum to the Chassis. Custom Silver RCA Input Jacks – Slightly Wider Spacing allows for Larger Modern Input Cables. Original Screw Style Speaker Output Terminals – Vintage Correct – Full Function (4,8,16 Ohm + Common/Ground). Heavy Duty Rubber Feet with Steel Bushings. New 3 wire grounded power cord. Assembled with Great Attention to Detail Using High Quality Parts – 48 hr Minimum Burn in Tested – Sounds Incredible. Operates From a Standard Wall Outlet – No Voltage Reducer or Variac Needed – Built for Today’s 120v+ Voltages. Arrives With Bias Preset. Just Install the Tubes – Simple To Do – Instructions are Included. Front Preamp Sockets are Wired for Bias Set Only – Reduces Audio Signal Interference. The photos shown here are of several different amplifiers, meant to provide an example of the units offered for sale. Yours will look like the ones in these photos. Some pictures may show different brands of tubes. The tubes that are included are described in this listing. Vintage Vibe – Modern Reliability – The Beautiful Sound of Tubes. So how does it sound? Magical – very musical with a highly detailed voice and plenty of solid, clean wonderful bass. This amp is absolutely dead quiet – no hum, no buzz, no hiss, no snap-crackle-pop! It sounds like it is supposed to. If you’re in search of that golden age of audio sound with stunning vintage looks, you’ve just found it. This is your bad boy. This is a 100% brand new amp, a very high quality build, total listening satisfaction. This ST-70 delivers dramatically improved sonics as the result of being carefully and thoughtfully built, all new, from the ground up, with technologically advanced components and all high-end parts. Is used with only a couple of re-engineered elements on the PCB solder traces to accommodate the 6GH8A tubes without having to use an adapter. Enjoy the rich smooth tones of analog audio and even order harmonics that only vacuum tube amplification can produce. It reveals musical qualities with fantastic realism and depth you may have never imagined possible. The legendary original design up to date with highly improved levels of sound quality, looks and performance. Because of the ST-70′s naturally high impedance (470K) it is compatible with virtually any solid state or tube preamp. This amplifier puts out 70 watts total, 35 watts per channel. It is fairly safe to say that most people today would have no idea of how wonderful a Stereo 70 amplifier is capable of sounding like. “Original condition” amps or those “updated” or having any number of “modifications” from mild to wild can still leave a lot to be desired. “Restored” is more than popping in a few capacitors and some tubes. Much more will need to be done to fully bring about that great sound the amp once had. Although they will play music, they are still incapable of reproducing the sound quality they possessed when new, 50 years ago unless they are fully restored. Resistors become noisy and drift out of tolerance due to age and heat. Circuit board and component materials begin to deteriorate causing signal degradation, solder joints and tube sockets can be loose, oxidized, worn and have poor quality connections causing signal interference and noise. Capacitors lose their range and clarity, their values having changed with time. Hiss, buzz, hum, pop and fuzziness are not normal or desirable qualities. Isn’t the great smooth sound of a time long gone by what you’re really after, those sweet tones produced only from tube amplification? Like a musical time machine, this amplifier will take you back to the beginning, like when these amps were new. But there’s even more to consider here. All of the components used in this amplifier have greatly improved characteristics over the ones available and used 50 years ago. That makes the sound quality of this amp even better than one would have been then, as a new one 50 years ago. Take a good close look at this one. Don’t cheat yourself out of what you’re really wanting; superb sound, high build quality, safe and reliable operation, great looks and that comforting pride of ownership. Pay particular attention to the size (height) of the power transformer on this amp (the middle one). Transformers are the heart and soul of a tube amp, period. Dynaco wasn’t messing around when they designed and built their originals. Notice how tall this new Dynakit transformer is compared to the original Dynaco PA060 power transformer. This is a real case of bigger is better. These new Dynakit transformers were reverse engineered from the original Dynaco designs using modern technologies and insulations. An increased lamination stack on this power transformer allows it to run cooler and provide better regulation. These transformers wont buzz or hum like the originals often do either. A major factor to consider here too is that the original transformers were designed to run from yesterday’s 117 Volt household current. Today’s household current is often 125 Volts or more so the use of a “step down” or “bucking” transformer is necessary to retard the voltage down to a safe operating level for amps having the original transformers. The new transformers are made for today’s higher household currents or VAC (Voltage). These transformers can be operated directly from your household outlets without secondary devices needed to reduce the voltage. These are USA made transformers that meet and exceed every aspect of the originals. If there were some sort of “magic” in the use of cloth leads, Dynakit would have certainly insisted on using them again. There’s simply no magic in cloth covered lead wire, period, it is inferior. In any comparison, these new transformers are just better than those old originals. Modern advancements in materials, methods and technologies used in the production of these transformers has resulted in superb transformers that operate quieter and cooler than the originals while providing less distortion, more power with increased reliability. The new A470 output transformers are also greatly improved, like the power transformer. The output transformers are interleaved/layer-wound and incorporate high quality M-6 grain oriented laminations. These also use better quality wire with better insulation, the primary is wound the same as the original A470 using the same number of turns on the same number of sections. These are made using the same patented Dynaco winding method, and made on the same core size and material type as the originals. These transformers are in one word, exceptional. I have selected the Groove Tubes 5AR4/GZ34 as the rectifier tube in my Dynaco 70′s for more than 2 years now. It has the highest current capability and has been 100% reliable, it also looks right at home in the amp. I believe it to be the best current production rectifier tube of its type on today’s market. Same story for the NessTone EL34/6CA7 tubes, they’re all I use now. These output tubes are hand selected and tested here in the USA and then identically matched as a quad (4 tubes) by their plate current test. Results using the ROE computerized testing system. I have had nothing but satisfied buyers and zero failures, they sound amazing. This amp also comes with 2 NOS RCA, GE or similar (as per availability) 6GH8A tubes, tested and matched. The 6GH8A like the 7199 tube is a vacuum tube combining both a pentode and triode in a single glass envelope. Each section has a separate cathode and is electrically independent, the pentode is used for the input stage, and the triode as a phase inverter. The Dynaco ST-70 Series II came from the factory with a 6GH8A driver board and tubes. According to Dynaco published research and literature the 6GH8A tube actually outperformed the 7199! I also offer this amp in a 7199 version, identical in build with the exception of the 7199 driver board and tubes. The photos show the ST-70 using the updated Dynakit PC-3 board made for 6GH8A tubes. Amplifier makers like HH Scott, Harman Kardon and Eico, among others, have used the 6GH8A since back in the late 50′s. I honestly find no audible difference in the 7199 and the 6GH8A so long as both tubes are of equal quality. Good quality tubes are essential for the overall sound quality simply because they are a part of the circuit, the circuit can only sound as good as it’s parts will allow. Good circuit design is critical, the Dynaco circuit is genius. The 6GH8A, also no longer in production, appears to be in abundant supply and is very affordable. Like all tubes, some brands and build styles offer both sonic and reliability advantages over cheaper, inferior made tubes. This amp comes with 2 NOS RCA, GE or a Mullard variant (as per availability) 6GH8A tubes, tested and matched. Contact me if you want the 7199 version, I’ll make a special listing for you. Tube installation instructions with a numbered easy to follow pictorial is included. Bias will be pre-set but due to variations in AC wall voltages the bias should be checked and adjusted as necessary for your specific location. Proper bias is essential for best sound quality and performance of the amplifier. Proper bias is also key to getting the most life out of your tubes. You are responsible for proper bias adjustment and maintenance, you will need a voltmeter that measures/reads DC volts and a small slot head screwdriver to turn the adjusters and to remove and reinstall the amplifiers cover. Bias should be set to 1.56 volts DC. Each unit is custom, a hand built, made to order unit. Your unit will look identical but wire color and routing may be slightly different from unit to unit, these are hand built units. Turnaround time is running 4-5 weeks right now. The manual with instructions, pictorials, diagrams, schematics and supplemental documentation is included. The item “NEW! Dynaco ST-70 Stereo Tube Amplifier, EL34 Push Pull Dynakit Amp, Not Vintage” is in sale since Wednesday, December 30, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “had-fun-moved-on” and is located in Coweta, Oklahoma. This item can be shipped to United States.
  • Model: Dynakit Stereo 70 / ST-70
  • Modified Item: No
  • Country/Region of Manufacture: United States
  • Custom Bundle: Yes
  • Included Tubes: (2) 6GH8A – (4) EL34 / 6CA7 – (1) 5AR4 / GZ34
  • Type: Tube Amplifier
  • MPN: DYNAKIT Stereo 70 / ST-70
  • Brand: Dynaco
  • Bundle Description: fully assembled amplifier with cover and all new tubes

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Friday, December 11th, 2020
Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

NEW Dynaco 70 / Dynakit Stereo 70 – 6GH8A TUBE VERSION. This Listing is for. Custom Built by Funtastic Vintronics. These are brand new amps – 100% – not a rebuild or a restoration – read the details. Enjoy the rich smooth tones of analog audio and even order harmonics that only vacuum tube amplification can produce. It reveals musical qualities with fantastic realism and depth you may have never imagined possible. The legendary original design up to date with highly improved levels of sound quality, looks and performance. Because of the ST-70′s naturally high impedance (470K) it is compatible with virtually any solid state or tube preamp. This amplifier puts out 70 watts total, 35 watts per channel. It is fairly safe to say that most people today would have no idea of how wonderful a Stereo 70 amplifier is capable of sounding like. “Original condition” amps or those “updated” or having any number of “modifications” from mild to wild can still leave a lot to be desired. “Restored” is more than popping in a few capacitors and some tubes. Much more will need to be done to fully bring about that great sound the amp once had. Although they will play music, they are still incapable of reproducing the sound quality they possessed when new, 50 years ago unless they are fully restored. Resistors become noisy and drift out of tolerance due to age and heat. Circuit board and component materials begin to deteriorate causing signal degradation, solder joints and tube sockets can be loose, oxidized, worn and have poor quality connections causing signal interference and noise. Capacitors lose their range and clarity, their values having changed with time. Hiss, buzz, hum, pop and fuzziness are not normal or desirable qualities. Isn’t the great smooth sound of a time long gone by what you’re really after, those sweet tones produced only from tube amplification? Like a musical time machine, this amplifier will take you back to the beginning, like when these amps were new. But there’s even more to consider here. All of the components used in this amplifier have greatly improved characteristics over the ones available and used 50 years ago. That makes the sound quality of this amp even better than one would have been then, as a new one 50 years ago. Take a good close look at this one. Don’t cheat yourself out of what you’re really wanting; superb sound, high build quality, safe and reliable operation, great looks and that comforting pride of ownership. Mundorf MCap ZN Capacitors – 600v – 5% – Values are increased to. 1uf for Improved Bass Response. 1% Accuracy Ultra Low Noise. 70 Watts Total Output – 35 Watts Per Channel – Pure Real Analog Power. Genuine Dynakit PC-3 “B” Circuit Board – Made Specifically for 6GH8A Driver Tubes – No tube Adapters here. Includes (2) tightly test matched Vintage NOS 6GH8A Tubes by RCA or GE (as per availability). Includes (4) New EL34 / 6CA7 NessTone Output Tubes – Plate Current Matched – Amazing Sound. Includes (1) New 5AR4 / GZ34 Rectifier Tube – Groove Tubes Label – Soft Start – High Current Capability. Bias Circuit uses 100uf Capacitors with Flameproof Metal Oxide Resistors. Dynakit PA-060 Power Transformer (120v Windings) – Notice its Size, the Increased Lamination Stack! Dynakit A-470 Output Transformers – (4,8,16 Ohm Taps) – Grain Oriented Laminations – Interleave Wound. Dynakit C-354 Shielded Power Supply Filter Choke – (1.75 Henries, 62 Ohms, 10%) – No More Nasty Leaks. 9 Brand New High Quality Tube Sockets. 600v & 1000v Wiring Used Throughout the Entire Amp. Genuine Dynakit Multi Section Filter Capacitor – Factory Correct Values 80/40/30/20uf – 525v Rated. New Dynakit Stainless Steel Mirror Finish Chassis (Non-Magnetic) – Beautiful Museum Quality Look. Brand New Dynakit Perforated Steel Cover w/ matching badge. Power Supply has Diode Rectification – No Scary Old Outdated Selenium Rectifier Here! Flashback Prevention Safety Diodes Installed at the Rectifier Tube. Additional shielding on under chassis components to reduce EMI / interference. Careful wire routing to reduce movement & electromagnetic signal interference (EMI). Assembled With Alpha Fry 60/40 rosin core solder – for the Very Best Quality Connections. Power Transformer Isolation Bushings Installed – Prevents the Transfer of Mechanical Hum to the Chassis. Custom Silver RCA Input Jacks – Wider Spacing for Larger Modern Input Cables. Original Screw Style Speaker Output Terminals – Vintage Correct – Full Function (4,8,16 Ohm + Common/Ground). Heavy Duty Rubber Feet with Steel Bushings. New 3 wire grounded power cord. Assembled with Great Attention to Detail Using High Quality Parts – 48 hr Minimum Burn in Tested – Sounds Incredible. Operates From a Standard Wall Outlet – No Voltage Reducer or Variac Needed – Built for Today’s 120v+ Voltages. Arrives With Bias Preset. Just Install the Tubes – Simple To Do – Instructions are Included. Front Preamp Sockets are Wired for Bias Set Only – Reduces Audio Signal Interference. The photos seen here are of several different amplifiers, meant to provide an example of the units offered for sale. Yours will look like the ones in these photos. Vintage Vibe – Modern Reliability – The Beautiful Sound of Tubes. So how does it sound? Magical – very musical with a highly detailed voice and plenty of solid, clean wonderful bass. This amp is absolutely dead quiet – no hum, no buzz, no hiss, no snap-crackle-pop! It sounds like it is supposed to. If you’re in search of that golden age of audio sound with stunning vintage looks, you’ve just found it. This is your bad boy. This is a 100% brand new amp, a very high quality build, total listening satisfaction. This ST-70 delivers dramatically improved sonics as the result of being carefully and thoughtfully built, all new, from the ground up, with technologically advanced components and all high-end parts. Is used with only a couple of re-engineered elements on the PCB traces to accommodate the 6GH8A tubes without having to use an adapter. Pay particular attention to the size (height) of the power transformer on this amp (the middle one). Transformers are the heart and soul of a tube amp, period. Dynaco wasn’t messing around when they designed and built their originals. Notice how tall this new transformer is compared to the original Dynaco PA060 power transformer. This is a real case of bigger is better. These new Dynakit transformers were reverse engineered from the original Dynaco designs using modern technologies and insulations. An increased lamination stack on this power transformer allows it to run cooler and provide better regulation. These transformers wont buzz or hum like the originals often do either. A major factor to consider here too is that the original transformers were designed to run from yesterday’s 117 Volt household current. Today’s household current is often 125 Volts or more so the use of a “step down” or “bucking” transformer is necessary to retard the voltage down to a safe operating level for amps having the original transformers. The new transformers are made for today’s higher household currents or VAC (Voltage). These transformers can be operated directly from your household outlets without secondary devices needed to reduce the voltage. These are USA made transformers that meet and exceed every aspect of the originals. If there were some sort of “magic” in the use of cloth leads, Dynakit would have certainly insisted on using them again. There’s simply no magic in cloth covered lead wire, period, it is inferior. In any comparison, these new transformers are just better than those old originals. Modern advancements in materials, methods and technologies used in the production of these transformers has resulted in superb transformers that operate quieter and cooler than the originals while providing less distortion, more power with increased reliability. The new A470 output transformers are also greatly improved, like the power transformer. The output transformers are interleaved/layer-wound and incorporate high quality M-6 grain oriented laminations. These also use better quality wire with better insulation, the primary is wound the same as the original A470 using the same number of turns on the same number of sections. These are made using the same patented Dynaco winding method, and made on the same core size and material type as the originals. These transformers are in one word, exceptional. I have selected the Groove Tubes 5AR4/GZ34 as the rectifier tube in my Dynaco 70′s for more than 2 years now. It has the highest current capability and has been 100% reliable, it also looks right in the amp. I believe it to be the best current production rectifier tube of its type on today’s market. Same story for the NessTone EL34/6CA7 tubes, they’re all I use now. These output tubes are hand selected and tested here in the USA and then identically matched as a quad (4 tubes) by their plate current test. Results using the ROE computerized testing system. I have had nothing but satisfied buyers and zero failures, they sound amazing. This amp also comes with 2 NOS RCA, GE or similar (as per availability) 6GH8A tubes, tested and matched. The 6GH8A like the 7199 tube is a vacuum tube combining both a pentode and triode in a single glass envelope. Each section has a separate cathode and is electrically independent, the pentode is used for the input stage, and the triode as a phase inverter. The Dynaco ST-70 Series II came from the factory with a 6GH8A driver board and tubes. According to Dynaco published research and literature the 6GH8A tube actually outperformed the 7199! I also offer this amp in a 7199 version, identical in build with the exception of the 7199 driver board and tubes. The photos show the ST-70 using the updated Dynakit PC-3 board made for 6GH8A tubes. Amplifier makers like HH Scott, Harman Kardon and Eico, among others, have used the 6GH8A since back in the late 50′s. I honestly find no audible difference in the 7199 and the 6GH8A so long as both tubes are of equal quality. Good quality tubes are essential for the overall sound quality simply because they are a part of the circuit, the circuit can only sound as good as it’s parts will allow. Good circuit design is critical, the Dynaco circuit is genius. The 6GH8A, also no longer in production, appears to be in abundant supply and is very affordable. Like all tubes, some brands and build styles offer both sonic and reliability advantages over cheaper, inferior made tubes. This amp comes with 2 NOS RCA, GE or a Mullard variant (as per availability) 6GH8A tubes, tested and matched. Contact me if you want the 7199 version, I’ll make a special listing for you. Manuals, Instructions, pictorials, diagrams, schematics and supplemental documentation are all included on a CD-Rom. Tube installation instructions with a numbered easy to follow pictorial included. Bias will be pre-set but due to variations in AC wall voltages the bias should be checked and adjusted for your specific location. Each unit is custom, a hand built, made to order unit. Your unit will look identical but wire color and routing may be slightly different from unit to unit, these are hand built units. Turnaround time is running 4-5 weeks right now. Straightforward simple business here. The manuals, instructions, pictorials, diagrams, schematics and supplemental documentation are all included on a CD-ROM. Issues from abuse, misuse, neglect or external damages are not covered. Damage from moisture of any kind, electrical surges, lightning and static electricity are not covered. Coverage is limited to replacement of any original components which have failed under normal operating conditions. Faulty components will be replaced with no charge to you. For parts or labor. The item “Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp” is in sale since Friday, December 4, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “had-fun-moved-on” and is located in Coweta, Oklahoma. This item can be shipped to United States.
  • Model: Dynakit Stereo 70 / ST-70
  • Modified Item: No
  • MPN: DYNAKIT Stereo 70 / ST-70
  • Country/Region of Manufacture: United States
  • Custom Bundle: Yes
  • Brand: Dynaco
  • Included Tubes: (2) 6GH8A – (4) EL34 / 6CA7 – (1) 5AR4 / GZ34
  • Type: Tube Amplifier
  • Bundle Description: fully assembled amplifier with cover and all new tubes

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Monday, November 30th, 2020
Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is

Dynaco Dynakit 70 Tube Amplifier. Includes two manuals (see last photo). Powers on, but I have no way to test it. Stored in climate-controlled basement. Part of my radio engineer father-in-law’s estate. Likely needs cleaning, at least. Amp weighs 32 lbs. The item “Dynaco Vtg Dynakit Stereo 70 Tube Amplifier Amp Powers On Untested Sold As Is” is in sale since Sunday, November 29, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “suzanne8433″ and is located in Walton, Kentucky. This item can be shipped to United States.
  • Brand: Dynaco
  • Type: Tube Amplifier
  • MPN: 70

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Thursday, November 19th, 2020
Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp

NEW Dynaco 70 / Dynakit Stereo 70 – 6GH8A TUBE VERSION. This Listing is for. Custom Built by Funtastic Vintronics. Turnaround time is 3 weeks or less. These are brand new amps – 100% – not a rebuild or a restoration – read the details. Enjoy the rich smooth tones of analog audio and even order harmonics that only vacuum tube amplification can produce. It reveals musical qualities with fantastic realism and depth you may have never imagined possible. The legendary original design up to date with highly improved levels of sound quality, looks and performance. Because of the ST-70′s naturally high impedance (470K) it is compatible with virtually any solid state or tube preamp. This amplifier puts out 70 watts total, 35 watts per channel. It is fairly safe to say that most people today would have no idea of how wonderful a Stereo 70 amplifier is capable of sounding like. “Original condition” amps or those “updated” or having any number of “modifications” from mild to wild can still leave a lot to be desired. “Restored” is more than popping in a few capacitors and some tubes. Much more will need to be done to fully bring about that great sound the amp once had. Although they will play music, they are still incapable of reproducing the sound quality they possessed when new, 50 years ago unless they are fully restored. Resistors become noisy and drift out of tolerance due to age and heat. Circuit board and component materials begin to deteriorate causing signal degradation, solder joints and tube sockets can be loose, oxidized, worn and have poor quality connections causing signal interference and noise. Capacitors lose their range and clarity, their values having changed with time. Hiss, buzz, hum, pop and fuzziness are not normal or desirable qualities. Isn’t the great smooth sound of a time long gone by what you’re really after, those sweet tones produced only from tube amplification? Like a musical time machine, this amplifier will take you back to the beginning, like when these amps were new. But there’s even more to consider here. All of the components used in this amplifier have greatly improved characteristics over the ones available and used 50 years ago. That makes the sound quality of this amp even better than one would have been then, as a new one 50 years ago. Take a good close look at this one. Don’t cheat yourself out of what you’re really wanting; superb sound, high build quality, safe and reliable operation, great looks and that comforting pride of ownership. Mundorf MCap ZN Capacitors – 600v – 5% – Values are increased to. 1uf for Improved Bass Response. PRP Audio Grade Resistors – High Resolution – 500v Rated – 1% Accuracy – Ultra Low Noise. 70 Watts Total Output – 35 Watts Per Channel – Pure Real Analog Power. Genuine Dynakit PC-3 “B” Circuit Board – Made Specifically for 6GH8A Driver Tubes – No tube Adapters here. Includes (2) tightly test matched Vintage NOS 6GH8A by RCA, GE (as per availability). Includes (4) New EL34 / 6CA7 NessTone Output Tubes – Plate Current Matched – Amazing Sound. Includes (1) New 5AR4 / GZ34 Rectifier Tube – Groove Tubes Label – Soft Start – High Current Capability. Bias Circuit uses 100uf Capacitors with Flameproof Metal Oxide Resistors. Dynakit PA-060 Power Transformer (120v Windings) – Notice its Size, the Increased Lamination Stack! Dynakit A-470 Output Transformers – (4,8,16 Ohm Taps) – Grain Oriented Laminations – Interleave Wound. Dynakit C-354 Shielded Power Supply Filter Choke – (1.75 Henries, 62 Ohms, 10%) – No More Nasty Leaks. 9 Brand New High Quality Tube Sockets. 600v & 1000v Wiring Used Throughout the Entire Amp. Genuine Dynakit Multi Section Filter Capacitor – Factory Correct Values 80/40/30/20uf – 525v Rated. New Dynakit Stainless Steel Mirror Finish Chassis (Non-Magnetic) – Beautiful Museum Quality Look. Brand New Dynakit Perforated Steel Cover w/ matching badge. Power Supply has Diode Rectification – No Scary Old Outdated Selenium Rectifier Here! Flashback Prevention Safety Diodes Installed at the Rectifier Tube. Additional shielding on under chassis components to reduce EMI / interference. Careful wire routing to reduce movement & electromagnetic signal interference (EMI). Assembled With Alpha Fry 60/40 rosin core solder – for the Very Best Quality Connections. Power Transformer Isolation Bushings Installed – Prevents the Transfer of Mechanical Hum to the Chassis. Custom Silver RCA Input Jacks – Wider Spacing for Larger Modern Input Cables. Original Screw Style Speaker Output Terminals – Vintage Correct – Full Function (4,8,16 Ohm + Common/Ground). Heavy Duty Rubber Feet with Steel Bushings. Assembled with Great Attention to Detail Using High Quality Parts – 48 hr Minimum Burn in Tested – Sounds Incredible. Operates From a Standard Wall Outlet – No Voltage Reducer or Variac Needed – Built for Today’s 120v+ Voltages. Arrives With Bias Preset. Just Install the Tubes – Simple To Do – Instructions are Included. Front Preamp Sockets are Wired for Bias Set Only – Reduces Audio Signal Interference. The photos seen here are of several different amplifiers, meant to provide an example of the units. Yours will look like the ones in these photos. Vintage Vibe – Modern Reliability – The Beautiful Sound of Tubes. So how does it sound? Magical – very musical with a highly detailed voice and plenty of solid, clean wonderful bass. This amp is absolutely dead quiet – no hum, no buzz, no hiss, no snap-crackle-pop! It sounds like it is supposed to. If you’re in search of that golden age of audio sound with stunning vintage looks, you’ve just found it. This is your bad boy. This is a 100% brand new amp, a very high quality build, total listening satisfaction. This ST-70 delivers dramatically improved sonics as the result of being carefully and thoughtfully built, all new, from the ground up, with technologically advanced components and all high-end parts. Is used with only a couple of re-engineered elements on the PCB traces to accommodate the 6GH8A tubes without having to use an adapter. Pay particular attention to the size (height) of the power transformer on this amp (the middle one). Transformers are the heart and soul of a tube amp, period. Dynaco wasn’t messing around when they designed and built their originals. Notice how tall this new transformer is compared to the original Dynaco PA060 power transformer. This is a real case of bigger is better. These new Dynakit transformers were reverse engineered from the original Dynaco designs using modern technologies and insulations. An increased lamination stack on this power transformer allows it to run cooler and provide better regulation. These transformers wont buzz or hum like the originals often do either. A major factor to consider here too is that the original transformers were designed to run from yesterday’s 117 Volt household current. Today’s household current is often 125 Volts or more so the use of a “step down” or “bucking” transformer is necessary to retard the voltage down to a safe operating level for amps having the original transformers. The new transformers are made for today’s higher household currents or VAC (Voltage). These transformers can be operated directly from your household outlets without secondary devices needed to reduce the voltage. These are USA made transformers that meet and exceed every aspect of the originals. If there were some sort of “magic” in the use of cloth leads, Dynakit would have certainly insisted on using them again. There’s simply no magic in cloth covered lead wire, period, it is inferior. In any comparison, these new transformers are just better than those old originals. Modern advancements in materials, methods and technologies used in the production of these transformers has resulted in superb transformers that operate quieter and cooler than the originals while providing less distortion, more power with increased reliability. The new A470 output transformers are also greatly improved, like the power transformer. The output transformers are interleaved/layer-wound and incorporate high quality M-6 grain oriented laminations. These also use better quality wire with better insulation, the primary is wound the same as the original A470 using the same number of turns on the same number of sections. These are made using the same patented Dynaco winding method, and made on the same core size and material type as the originals. These transformers are in one word, exceptional. I have selected the Groove Tubes 5AR4/GZ34 as the rectifier tube in my Dynaco 70′s for more than 2 years now. It has the highest current capability and has been 100% reliable, it also looks right in the amp. I believe it to be the best current production rectifier tube of its type on today’s market. Same story for the NessTone EL34/6CA7 tubes, they’re all I use now. These output tubes are hand selected and tested here in the USA and then identically matched as a quad (4 tubes) by their plate current test. Results using the ROE computerized testing system. I have had nothing but satisfied buyers and zero failures, they sound amazing. This amp also comes with 2 NOS RCA, GE or similar (as per availability) 6GH8A tubes, tested and matched. The 6GH8A like the 7199 tube is a vacuum tube combining both a pentode and triode in a single glass envelope. Each section has a separate cathode and is electrically independent, the pentode is used for the input stage, and the triode as a phase inverter. The Dynaco ST-70 Series II came from the factory with a 6GH8A driver board and tubes. According to Dynaco published research and literature the 6GH8A tube actually outperformed the 7199! I also offer this amp in a 7199 version, identical in build with the exception of the 7199 driver board and tubes. The photos show the ST-70 using the updated Dynakit PC-3 board made for 6GH8A tubes. Amplifier makers like HH Scott, Harman Kardon and Eico, among others, have used the 6GH8A since back in the late 50′s. I honestly find no audible difference in the 7199 and the 6GH8A so long as both tubes are of equal quality. Good quality tubes are essential for the overall sound quality simply because they are a part of the circuit, the circuit can only sound as good as it’s parts will allow. Good circuit design is critical, the Dynaco circuit is genius. The 6GH8A, also no longer in production, appears to be in abundant supply and is very affordable. Like all tubes, some brands and build styles offer both sonic and reliability advantages over cheaper, inferior made tubes. This amp comes with 2 NOS RCA, GE or a Mullard variant (as per availability) 6GH8A tubes, tested and matched. Contact me if you want the 7199 version, I’ll make a special listing for you. Manuals, Instructions, pictorials, diagrams, schematics and supplemental documentation are all included on a CD-Rom. Tube installation instructions with a numbered easy to follow pictorial included. Bias will be pre-set but due to variations in AC wall voltages the bias should be checked and adjusted for your specific location. Each unit is custom, a hand built, made to order unit. Your unit will look identical but wire color and routing may be slightly different from unit to unit, these are hand built units. Straightforward simple business here. The manuals, instructions, pictorials, diagrams, schematics and supplemental documentation are all included on a CD-ROM. Issues from abuse, misuse, neglect or external damages are not covered. Damage from moisture of any kind, electrical surges, lightning and static electricity are not covered. Coverage is limited to replacement of any original components which have failed under normal operating conditions. Faulty components will be replaced with no charge to you. For parts or labor. The item “Dynaco Dynakit ST-70 Stereo Tube Amplifier, New, Not Vintage EL34 Push Pull Amp” is in sale since Sunday, November 15, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “had-fun-moved-on” and is located in Coweta, Oklahoma. This item can be shipped to United States.
  • Model: Dynakit Stereo 70 / ST-70
  • Modified Item: No
  • Country/Region of Manufacture: United States
  • Custom Bundle: Yes
  • Included Tubes: (2) 6GH8A – (4) EL34 / 6CA7 – (1) 5AR4 / GZ34
  • Type: Tube Amplifier
  • MPN: DYNAKIT Stereo 70 / ST-70
  • Brand: Dynaco
  • Bundle Description: fully assembled amplifier with cover and all new tubes