Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Sunday, January 22nd, 2023
Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco (Dynakit) Stereo 70 (ST-70). Vintage Stereo tube amplifier. Serviced: cleaned and vacuumed chassis, cleaned all controls and switches, and jacks. Tested all tube outputs. Installed replacement 7199 tube. Replaced fuse, connection at fuse holder and set bias. The Dynakit Stereo 70 is a complete dual 35 watt power amplifier kit which offers the highest possible fidelity, at low cost and in a compact arrangement. It uses a patented circuit of outstanding performance characteristics, along with top quality parts, including the new Dynaco Super-Fidelity A-470 transformers – the finest available. The measured specifications show that the Stereo 70 is an amplifier of unequalled performance, and its listening quality is also unrivalled by any regardless of price. The two non-interacting 35 watt channels provide adequate power, in a stereophonic or two channel system, for loudspeakers of any level of efficiency. The channels can be paralleled for a full 70 watts of low distortion output, suitable for practically any monophonic use even where several loudspeakers are in use in different areas. The high power capability and low internal impedance provide excellent damping for all types of high quality speaker systems without need to make adjustments to match specific speaker installations. The design features of your Dynakit which contribute to its superior listening quality include some which are not revealed by the customary steady-state laboratory measurements. For example, it does not exhibit bounce and flutter when pulsed with a transient signal. Thus a sharp percussive signal like a drum beat or a piano note will be reproduced with sharpness and clarity and neither overhang nor muddiness. The Stereo 70, unlike many other amplifier circuits, has been designed to provide its specified performance on a loudspeaker load, not just under laboratory measuring conditions. Therefore, the connection of a loudspeaker to the amplifier does not deteriorate its performance or listening quality. AS-IS sale due to age. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps”. The seller is “infinityrecordsusa” and is located in this country: US. This item can be shipped worldwide.
  • Brand: Dynaco
  • Type: Power Amplifier
  • Model: ST-70

Vintage Dynaco ST-70 Tube Amplifier

Thursday, December 15th, 2022
Vintage Dynaco ST-70 Tube Amplifier

Vintage Dynaco ST-70 Tube Amplifier

Vintage Dynaco ST-70 Tube Amplifier

Vintage Dynaco ST-70 Tube Amplifier

Vintage Dynaco ST-70 Tube Amplifier

Vintage Dynaco ST-70 Tube Amplifier. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “5qc7w-34″ and is located in this country: US. This item can be shipped to United States.
  • Brand: Dynaco
  • Type: Tube Amplifier
  • Model: Dynaco ST-70
  • Country/Region of Manufacture: United States

Dynaco Dynakit ST-70 Vintage Stereo Tube Amplifier many upgrades

Thursday, November 24th, 2022
Dynaco Dynakit ST-70 Vintage Stereo Tube Amplifier many upgrades

Dynaco Dynakit ST-70 Vintage Stereo Tube Amplifier many upgrades

Dynaco Dynakit ST-70 Vintage Stereo Tube Amplifier many upgrades

Dynaco Dynakit ST-70 Vintage Stereo Tube Amplifier many upgrades

Stereo input gain knob, upgraded driver board, upgraded power supp ly filtering board, speaker post for banana plugs. It looks and sounds great. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “bruceroberts” and is located in this country: US. This item can be shipped to United States.
  • Brand: Dynaco
  • Type: Tube Amplifier
  • Model: ST-70
  • MPN: ST-70
  • Country/Region of Manufacture: United States

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34′s Vintage

Thursday, November 24th, 2022
Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier, with new TAD EL34's Vintage

Tested, Serviced and upgraded. It has been kept as stock as possible, with only the parts needed to perform its best being changed. Comes with Brand new Matched Quad of TAD EL34-STR REDBASE Power Tubes. Comes with two Speaker cables, Canare 4S11 with small audioquest spades on one end and Banana plugs on the other. This is a pretty well cared for ST-70 that has been serviced multiple times over the years, including just recently and sounds very nice. In addition to the TAD EL34′s it Includes 4 rather old. Other tubes include 2 GE 7199′s. Rectifier has been rewired out of circuit and replaced by solid state rectification, although the tube remains in the socket for looks and receives heater voltage to light it up. All capacitors have been updated. Coupling capacitors and others were replaced with high quality polypropylene film caps for the best sound quality possible. All filter caps have been replaced. Checked and replaced as needed. The chrome has some small pitting and small rust spots but it’s in very good shape compared to most ST-70′s. Quite a lot of solder joints were redone to keep it as trouble free as possible. Cage is in very nice shape. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “tboxlabs” and is located in this country: US. This item can be shipped to United States.
  • Brand: Dynaco
  • Type: Power Amplifier
  • Model: ST-70

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Tuesday, November 8th, 2022
Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part

Vintage Dynaco ST-70 Dynakit Stereo Tube Amplifier for Repair or Part. Cover is in Excellent Condition. Chasis got Light Rust. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “notjusthifi” and is located in this country: US. This item can be shipped worldwide.
  • Brand: Dynaco
  • Type: Tube Amplifier
  • Model: ST-70
  • Country/Region of Manufacture: United States
  • Modified Item: No

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier Vintage

Tuesday, October 25th, 2022
Dynaco ST-70 Dynakit Stereo Tube Power Amplifier Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier Vintage

Dynaco ST-70 Dynakit Stereo Tube Power Amplifier Vintage

Fully tested and recently serviced. Amplifier is in good cosmetic condition. Some rust inside tube cage, and lettering has come off the chrome with time. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “colmcc-79″ and is located in this country: US. This item can be shipped to United States.
  • Brand: Dynaco
  • Type: Power Amplifier
  • Model: ST-70

Dynaco ST-70 with Van Alstine Ultimate 70 mods

Saturday, October 8th, 2022
Dynaco ST-70 with Van Alstine Ultimate 70 mods

Dynaco ST-70 with Van Alstine Ultimate 70 mods

Dynaco ST-70 with Van Alstine Ultimate 70 mods

Dynaco ST-70 with Van Alstine Ultimate 70 mods

Dynaco ST-70 with Van Alstine Ultimate 70 mods

Dynaco ST-70 with Van Alstine Ultimate 70 mods

Dynaco ST-70 with Van Alstine Ultimate 70 mods

Dynaco ST-70 with Van Alstine “Ultimate 70″ mods. This is a legendary amplifier and a piece of audio history that’s been modernized by Frank Van Alstine. The mono/stereo switch has been removed, input and speaker jacks have been rewired and replaced, and a heavily upgraded circuit board has been installed. Current output tubes are Psvane EL34B; Cosmetics are 8/10 due to some rubbed off lettering on the chassis. I live in suburban Portland, Oregon. Problems are few, and I’m very pro-active about solving any that might crop up. Please examine the pictures carefully. They are part of the description. This is NOT a new component. As such, it does not come with any guarantee– implied or written. Vintage audio equipment is sensitive and does not travel particularly well. So in rare instances, that which was working 100% at my house may require adjustment or servicing before working equally well at yours. Most on-line sales of vintage electronics happen under these exact same conditions-but I just wanted to point this out so there are no misunderstandings or disappointments. Spoiler Alert: They will NOT allow this. But please understand: I simply clicked a box making this available to International buyers. Here are a couple that my International customers have successfully used in the past and have a good reputation: Nippon Express USA or U. Both are located in San Pedro, CA. Contact info is available on-line. I’m looking forward to doing business with you and earning more of it in the future. I absolutely LOVE this stuff, and you will find me to be a reasonable, fair-minded person to deal with. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “marpentrac_0″ and is located in this country: US. 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, Sweden, Korea, South, Indonesia, South Africa, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain, Croatia, Republic of, Malaysia, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Luxembourg, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.
  • Brand: Dynaco
  • Type: Tube Amplifier
  • Model: Stereo 70
  • Featured Refinements: Vintage Stereo Amplifier
  • Country/Region of Manufacture: United States
  • Modified Item: No

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90′s

Sunday, July 24th, 2022
Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

Dynaco ST-70 Vintage Stereo Tube Amplifier Hot Rodded with KT90's

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 amplifier is a hot rodded version of the famous Dynaco ST-70 stereo tube amplifier. The modification kit was provided by and is referred to as the ST-120. This kit features larger power and output transformers which enables the amp to handle larger output tubes. This amp is currently fitted with KT-90 type tubes but can also run 6550′s and others. It has two top panel mounted switches that allow it to be toggled between Triode and Ultralinear modes. Triode operation yields about 40W per channel while Ultralinear delivers close to 60W per channel. The kit builder converted the front panel stereo / mono control to a 4 ohm / 8 ohm switch. The unit also features a WZ68 solid state rectifier. Yes – Printed Copy. Yes – Power Only. We have too many items for sale and it’s 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 we’re 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. We’re not a store, so please don’t make an appointment if you’re 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. It’s also great for ensuring your new turntable is setup correctly in its final resting place. 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 this country: US. This item can be shipped to United States, Canada.
  • Brand: Dynaco
  • Type: Tube Amplifier
  • MPN: ST-70
  • Model: ST-70
  • Country/Region of Manufacture: United States

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Sunday, May 29th, 2022
Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Dynaco ST-70 Stereo 70 Tube Power Amplifier UNTESTED ED DUDA MODIFIED FOR FIX

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier It is untested – NO TUBES. THE TUBES ARE NOT INCLUDED.. I bought this to use myself but have since bought a pair of mkiv. And then they stopped working. There is a burnt out resistor and another one that is cracked. I bought the resistor to replace it but never got round to it. I understand a lot was done by way of modifications including the meters and the individual test points for each tube and adjustments. It’s a beautiful amp and I’m sure it will give the new owner good sound once fixed up. I’m including the new and old resistors and also the old driver board. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “hififorfood” and is located in this country: US. This item can be shipped worldwide.
  • Brand: Dynaco
  • Type: Power Amplifier
  • Custom Bundle: No
  • Model: Dynakit Stereo 70
  • Featured Refinements: Vintage Stereo Vacuum Tube Amplifier
  • MPN: ST-70
  • Country/Region of Manufacture: United States
  • Modified Item: No

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Monday, December 27th, 2021
Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working

Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 HIFI Amp ST70. This is working, 2 new switches were just replaced. Brought up on a variac, tested and working. In very nice condition. Comes with cage, all tubes etc. Out of a collection of Vintage Tube, Solid State and rare electronics. Please visit our store as we get vintage electronics of tube, test, solid state, hifi, audio, etc Many great and rare items as well. Some of the electronic part/s may continue for another 50 years without need of replacement and some electronic part/s may fail a few days after you start using the item. David Hafler and Ed Laurent founded the Dyna Company (later Dynaco) with the intention of not only producing transformers, but high-quality audio circuitry. The company was incorporated in October 1955, with business premises located at 617 N. 41st St in Philadelphia. Dynacos first product was the Mk. II 50-watt power amplifier. Available as a kit or pre assembled unit, the Mk. III amplifier, which produced 60 watts. Dynaco continued to build both mono and stereo amplifiers until 1977. The companys final contribution to vacuum tube technology was the massive Mk. VI mono power amplifier of 1976, which produced 120 watts (continuous). Dynaco is best remembered for its highly regarded vacuum tube stereo amplifier, the Stereo 70 (ST-70). Introduced in 1959, the ST-70 was available as a kit (Dynakit) intended for assembly by the purchaser or as a complete factory-wired unit (Dynaco). The ST-70 used four EL34 output tubes, one GZ34/5AR4 rectifier tube, two 7199 input (driver) tubes, two output transformers, one power transformer, and a pre-assembled printed circuit board (PCB) containing the driver circuit. It produced 35 watts per channel. The driver circuit had a single 7199 pentode/triode tube per channel, and used the driver tube to handle both voltage amplification and phase splitting. The output transformers are an ultra linear design, whereby part of the primary winding is fed back to the output tubes screen grid. This design reduced distortion and improved audio quality. A masterpiece of efficient circuit design, the ST-70 provided reliable, high-quality audio amplification at an affordable price. The popularity of the ST-70 contributed more than any other single product to continuing consumer interest in tube-based stereo amplifiers at a time of increasing market dominance by solid state audio products. Because of its excellent value for cost, Dynaco tube amplifiers were often referred to as the poor mans McIntosh. The item “Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working” is in sale since Thursday, October 14, 2021. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “middlemansalesandauctions” and is located in Ellenville, New York. 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, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.
  • Model: Dynakit Stereo 70
  • Modified Item: No
  • Country/Region of Manufacture: United States
  • Custom Bundle: No
  • Featured Refinements: Vintage Stereo Vacuum Tube Amplifier
  • Type: Power Amplifier
  • MPN: ST-70
  • Brand: Dynaco