Vintage Tube 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

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

Dynaco Stereo Tube Amp ST-70 Vintage. Unit powers on and tubes glow orange (see photos). Needs to be cleaned. Check my other auctions for other components. The item “Dynaco Stereo Tube Amp ST-70 Vintage” is in sale since Friday, October 30, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “wberry2001″ and is located in Asheville, North Carolina. This item can be shipped to United States.

• Brand: Dynaco
• Model: ST-70
• Country/Region of Manufacture: United States

Dynaco ST-70 Stereo 70 Dynakit Tube Amplifier INCLUDES 7199 TUBES. For the purist – this amp uses the 7199 tubes & PC3 c. Ircuit board and includes a pair of RCA 7199 tubes. This Listing is for PRE ORDER ONLY – these are Custom Built. 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 – German made – 600v – 5% – Values are. 1uf – Improved Bass Response. PRP Audio Grade Resistors – High Resolution – 500v Rated – 1% Accuracy – Ultra Low Noise. 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. Dynakit PC-3 “A” Circuit Board – Made Specifically for 7199 Driver Tubes. Includes (2) tested and matched Vintage 7199 by RCA (brand subject to 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. Power Supply 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). Includes (4) Speaker Wire Spade Terminal Adapters AND (2) Right Angle RCA Input Connectors. 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. 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 7199 tubes. About the 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 sound very nice. If there were any more important part of a tube amplifier we’d talk about that here, 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 their originals. These new Dynakit transformers were. Reverse engineered from the original Dynaco designs. Like the originals, these have grain oriented laminations and interleaved windings. 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. 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 paper and a CD. 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. Will be kept informed in a communication loop 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 / 7199 TUBES” is in sale since Friday, August 7, 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: ST-70 / Stereo 70
• Country/Region of Manufacture: United States
• Type: Tube Amplifier
• MPN: ST-70 / Stereo 70 Tube Amplifier
• Brand: Dynaco

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

Vintage Dynakit Stereo ST-70 Tube Amplifier in good working condition; quiet with no hum. Pretty impressive for a 50-60-year-old amp; a testament I think to its design and parts used. Powered up slowly on a variac with speakers attached. Comes with all tubes shown which were tested to be fine and a cage. All original circuitry and should be checked out by a tech for everyday use. The specified 5AR4 rectifier has been substituted by a 5U4 which is approved in the original Dyna manual for temporary use but that was when the other components were new and robust, so that should be changed out soon as their characteristics are different. I wanted to offer a working unit so that is why Im including it. Also, due to age and storage, the chrome is pitted and a foot is missing. The EL34/6CA7 tubes are new, made in China. The other tubes are vintage. Classic good sounding Dynaco for your collection. These are automatically added to the final invoice and I’m not able to delete or adjust them. Also, recently Fed Ex and the other carriers have dramatically increased costs when factoring even a small amount of dimensional weight (size of the box). The item “DYNACO Dynakit Stereo 70 Tube AMPLIFIER Vintage EL34 6CA7 ST-70 Amp Works” is in sale since Tuesday, April 28, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “anomieguru” and is located in San Francisco, California. This item can be shipped to United States, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Turks and caicos islands, Bangladesh, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Nicaragua, Pakistan, Paraguay, Uruguay, Russian federation.

Welcome to Ramons Atic. The item is in good condition. If not I will describe any problem. This Dynakit Stereo 70 Tube Amplifier needs to be repaired. The main fuse blows out when the 5AR4 tube is in. When there are no tubes in the set the fuse is okay. There is a short somewhere in the HV B+ Supply? There is NO bottom cover and Cage is in very good condition. TUBES COME WITH THIS AMPLIFIER. This is a HARD to FIND item! What a Fantastic Find! Outstanding for all of your Audio & Electronic Project needs! MOST ARE THE LAST ONES I HAVE! Mikey says : They are. Not: APO FPO etc. Thank you in advance; Ramon. The item “Vintage Dynaco Dynakit ST-70 Stereo Tube Amplifier AS-IS for Parts / Restoration” is in sale since Saturday, June 22, 2019. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Other Vintage Audio & Video”. The seller is “ramonsatic” and is located in Mount Holly, New Jersey. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Ecuador, Sri lanka, Luxembourg, Peru, Viet nam, Uruguay.

All tubes are vintage tubes and included. I also think the preamp is in original form, no modifications. I plugged it in for testing and both channels worked and produced good music. I found the Spare (and probably other) input has one channels dropped. I tried “Special” and then OK. So, this preamp may need some cleaning and adjustment before daily use; just like all vintage electronics. Physical condition is pretty good for the age. Some discoloration/wear/scratches, as shown on the pictures. All knobs are original. The item “Dynaco PAS-2 Tube Preamplifier Preamp for ST-70 Amp Works, All Vintage Tubes” is in sale since Wednesday, February 27, 2019. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Preamps & Tube Preamps”. The seller is “timekinetics” and is located in Oakland, California. This item can be shipped worldwide.

• Brand: Dynaco
• Model: PAS-2

This Amplifier has been in storage for 15 years. I powered it up and it worked. I did not test it further. The item “Vintage Dynaco Dynakit Stereo ST-70 Tube Power Amp” is in sale since Sunday, September 30, 2018. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “ezgoer11″ and is located in Frederick, Maryland. This item can be shipped to United States.

• Brand: Dynaco
• MPN: Stereo 70

JIMJAMSVINTAGEMUSIC brings you this vintage Dynaco ST-70 stereo tube amplifier. This amplifier is in good cosmetic condition, There is quite a bit of light pitting on the chassis. The cage is in good condition and has a few scratches here and there but nothing bad at all. The electronics look to be original and the transformers are all good. This amplifier will need serviced by you or a technician before every day use and should not be considered plug n play. If you have any questions please ask before purchasing. PACKAGE SIZE WILL BE 16 X 12 X 9 and weigh 32lbs. The item “VINTAGE DYNACO ST-70 STEREO TUBE AMPLIFIER #2″ is in sale since Friday, August 24, 2018. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “jimjam041″ and is located in Orrville, Ohio. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica.

• Model: ST-70
• Country/Region of Manufacture: United States
• Type: Stereo amplifier
• Brand: DYNACO