Vintage Tube Amp

NEW Dynaco 70 / Dynakit Stereo 70 – 6GH8A TUBE VERSION. This Listing is for PRE ORDER ONLY – these are Custom Built to order for you – Turnaround time is 3 weeks or less. 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. It is fairly safe to say that most people today would have no idea of how wonderful a Stereo 70 amplifier is capable of. Of these various states and varieties of operating conditions is a gamble. “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. 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. You simply won’t believe that you are listening to a Dynakit, but you’ll sure be glad that you are. 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. 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 or Mullard (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 – Highest Current Capability. Bias Circuit Has Upgraded German Made 100uf F&T 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 in Black / 600v & 1000v Alpha 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 / Cage – Factory Painted in Black or Original Brown 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 and extra clamps to reduce movement & electromagnetic signal interference (EMI). Assembled With Alpha 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 – Vintage Correct Look – Wider Spacing for Larger Modern Input Cables. Original Screw Style Speaker Output Terminals – Vintage Correct – Full Function (4,8,16 Ohm + Common/Ground). Retro Style Cloth Covered 16 Gauge Power Cord – 2 Prong Non-grounded Non-polarized Plug. Heavy Duty Rubber Feet with Steel Bushings – (Height). 437″ / (Diameter) : 1.062″ Tapering Down to 1.00. 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 (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. Vintage Vibe – Modern Reliability – The Beautiful Sound of Tubes – Priceless Pleasure. 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 high-end parts. The stock Dynaco circuit is used with only a couple of re-engineered elements on the PCB to. I build these amps like I was going to keep them myself, forever. This is a complete, ready to go amplifier. You will LOVE this amp. If you’re waiting for a nicer one to come along, pull up a really comfortable chair, you’ll be here a while. I have selected the Groove Tubes 5AR4/GZ34 as the rectifier tube in my Dynaco 70′s for more than a year 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 are very close in build to the legendary SED “Winged C” tubes of years ago. 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. Sound, build quality and their vintage looks. This amp comes with 2 NOS. RCA, GE or Mullard (as per availability). 6GH8A tubes, tested and matched. About the old original 7199 tubes. The 7199 vacuum tube combines both a pentode and triode in a single glass envelope. This is the tube used on the standard stock circuit board. Of the Dynaco 70. Each of the tubes two sections has a separate cathode and is electrically independent. In the Dynaco 70 the pentode is used for. The input stage, and the triode as a phase inverter. American 7199 production ended entirely sometime in the 1980s while the Soviet made Sovtek 7199. Was produced until about 2007. As a result the tube is becoming increasingly scarce and rather expensive. Finding good quality, properly functioning. Matched pairs is growing even more difficult as supplies run shorter at an increasing rate driving prices even higher by way of supply and demand. Good quality 7199′s in a healthy Dynaco 70 circuit do sound very nice. Enter the 6GH8A Tube. 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. Using the updated Dynakit PC-3 board made. For 6GH8A tubes, this tube can now be used with exceptional results. Amplifier makers like HH Scott, Harman Kardon and Eico, among others, have. Used the 6GH8A since back in the late 50′s. I find no audible difference in the 7199 and the 6GH8A so long as both tubes compared 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. Good circuit design is critical, the Dynaco circuit is genius. The 6GH8A, also no longer in production, appears to be in abundant supply and. Like all tubes, some brands and build styles offer both sonic and reliability advantages over cheaper, inferior made tubes. We saved the best for last. The transformers are the heart and soul of the tube amp, period. Dynaco wasn’t messing around when they designed and built. These new Dynakit transformers were. Reverse engineered from the original Dynaco designs. Like the originals, these have grain oriented laminations and interleaved windings. These are USA made current production genuine. Dynakit 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 used them again here, you can bet that. But, there’s is no magic in cloth covered lead wire, period. In an apples to apples. Showdown, these are better than those. Modern advancements in materials, methods and technologies used in the production of these. Transformers has resulted in transformers that operate quieter and cooler than the originals while providing less distortion, more power. These transformers are in one word, exceptional. 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 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 3 weeks or less. (most of the time is awaiting parts arrival) Once. Will be kept informed with messages and updates, photos and progress notes direct from me. Straightforward simple business here. 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 “New not Vintage Amp / Dynaco ST-70 Stereo 70 Dynakit Tube Amplifier 6GH8A Tubes” is in sale since Saturday, August 1, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “funtastic-vintronics” and is located in Coweta, Oklahoma. This item can be shipped to United States.

• Model: Dynakit Stereo 70 / ST-70
• Modified Item: Yes
• Country/Region of Manufacture: United States
• Custom Bundle: Yes
• Type: Tube Amplifier
• MPN: DYNACO Stereo 70 / ST-70
• Modification Description: multiple upgrades as listed below
• Brand: Dynaco
• Bundle Description: complete amplifier with tubes as described below