Vintage Tube Amp

Dynaco A-470 ST-70 Vintage Output Transformers Pair for Tube Amplifier.

For sale is a set of a Dynaco SCA-35 tube integrated amplifier and Dynaco FM-3 tube FM Tuner. I believe both units have their original tubes, however I have not opened them. Both units work and sound great. These units were not cleaned or serviced! No speakers, cables, antennas or any other accessories included. For sale are two units only. Each unit has an embedded power cord. Please look at pictures as they are a part of description.

The unit is being serviced, and all the contact and switched has been cleaned with no issue. Brand New Russia Tubes on Power Supply. 5 RCA, 1 DYNACO on signal path, all original. Due to the age of the amp. No return is accepted.

DYNACO STEREO70 vacuum tube power amplifier. Can be used with 100V, but sound quality will be inferior. We recommend using 117V. Size: Width 330mm x Depth 240mm x Height 165mm. We accept return items up to 60 days after the item has arrived. International Buyers – Please Note.

Being an electronics tech, I see voltages that are way too high for the designed circuit. Nice looking bucking transformer with stainless cover! Turns device and your equipment on or off. You have a choice of 3% or 7% voltage drop. All vintage tube equipment should be using this voltage reducer. Read on; After WWll and up until 1968, household voltages were 117 volts. Typically voltages these days range from 120-125. Your vintage audio equipment was designed to operate around lower voltages of years ago. You might ask yourself what is a few extra volts? Take into account that the power supply in your vintage device is multiplying those few extra volts many times so that the end result could be 20-30-40 volts more than the circuit was designed for. This could lead to transformer failure, component failure and shorter tube life. As you can see in the photo, the voltage reducer brought the line voltage down from 124 to 116. This is approximately a 7% drop. Simply plug your vintage electronics into the reducer outlet. Will work with equipment drawing up to a total of 4 amps. Has protective 4 amp fusing. Metal box is grounded through heavy duty 3 wire power cord. As an example; Photo shows voltage of Dynaco ST-70 at 467v on todays line voltage and then 438v plugged into the voltage reducer. The correct voltage for this Dynaco amp calls for 435v at this point. Also your filament voltage will be more in line with what it should be. All other voltages are much closer to Dynaco factory specifications with the reducer. Your device will run cooler and safer, extending component, transformer and tube life! Please state voltage drop preference when ordering. Strongly recommended for Dynaco St 70, since they were produced with power transformers designed to operate with 117 line voltage. Your transformer will run cooler, tubes will last longer and all voltages will be closer to where they should be!

Dynaco Stereo 80 ST-80 Amplifier. Has All 4 Original Feet. Cord Has No Cracks. No Signs Of Corrosion. Lamp On Power Switch Works. Outstanding Condition And Sonics. Please Examine Photos Closely For Cosmetic Condition. Other items From My Collection May Be Viewed In My Listings. A rare piece greatly appreciated by audiophiles and not often seen. A Fantastic Addition To Any Vintage Collection. Power output: 40 watts per channel into 8? (stereo). Frequency response: 10Hz to 50kHz. Total harmonic distortion: 0.5%. Input sensitivity: 1.3V. Signal to noise ratio: 90dB. Speaker load impedance: 4? To 16? Semiconductors: 12 x transistors, 10 x diodes. Dimensions: 14 x 8 x 4 inches. The Dynaco Stereo 80 is an all silicon transistor basic power amplifier for use with separate preamplifiers such as the Dynaco PAT-4 or PAT-5 or for use with tape recorders or tuners such as the Dynaco FM-5 which have their own volume controls. The unit contains two 40 watt amplifiers on one chassis with a common power supply. It has been designed to be used under normal conditions without special safety precautions, just as if it were a high grade tube amplifier. There are no circuit breakers, speaker fuses, or other resettable devices to impede the use of the Stereo 80 under any reasonable conditions of use or abuse. This is achieved by using novel circuits (on which patents are pending) which automatically and instantly protect the amplifier. The components are of the highest quality to protect against failure, both now and for many years in the future. All parts are used conservatively with close tolerances to assure proper operation, and etched circuit modules are pretested under actual use conditions to ensure that every unit, after assembly, will meet the specifications normally associated with laboratory prototypes. The specifications of the Stereo 80 speak for themselves. The distortion at low levels is comparable to that of the finest tube designs, while the high power distortion remains inaudible. See my other auctions for a matching Dynaco PAT-4 Stereo Preamplifier to mate with this. Please check my other auctions for more vintage electronics.

If you are like me, you like to see what you are getting, so I took lots of pics. Check out my other cool listings! My other job is pastoring a Church in Florida. I’m not some large corporation, just a regular guy making his way for his family. I scour estate sales, garages, attics and anywhere to find many unique and rare items. Virtually everything I sell is previously owned, so I understand that sometimes problems may arise. Please do not open a case. Your satisfaction is important to me. The stars count, too. If there is a problem, please message me. I can usually accommodate when requested. 1.16.23– 4.7.23 — 5.4.23-8.8.23–9.23– 7.1.24.

Vintage Dynaco Dynakit Mark III KT88 Stereo Amplifier. This amplifier has been tested and serviced and is in good working condition. Has a set of Svetlana Power Tubes, one is labeled McIntosh and the other straight Svetlana. The 5AR4 Rectifier is an American Made Westinghouse, and the 6AN8 is a Sylvania. True Dynaco Dynakit MK III Monoblock manufactured in Philadelphia. One of the most highly regarded vintage audio tube amplifiers ever built.

Dynaco ST-70 Tube Amplifier – Working – good condition. Please see the detailed photos for more on condition. Guaranteed to be as described. A picture is worth a thousand words, and I always picture the actual item(s) for sale, so please look carefully at the accompanying photo(s). What you see in the photos is what you get.