Here for your consideration is an original vintage Dynaco Dynakit ST70 Stereo 70 that has just been recapped with high end capacitors and has a new matched quad of Solvtek EL34s that produce 35 Watts RMS per channel. The ST 70 needs little introduction, as it was probably the most popular tube amplifier ever built. This 13’ x 9.5’ x 6.5’ amplifier was first introduced in 1959 and sold for $99.95 as a kit. This one retains its original cover. A headphone output jack was installed on the front by the previous owner.
My Tech Friend Tom did the chassis work, and replaced all the necessary capacitors with quality new capacitors. This is one of the most expensive repairs I pay him for because of the 30/20/20/20 @ 525Volt Can Capacitor- but it’s worth it for the sound. The chassis has had no cleaning done to it. It is in good cosmetic condition with scratches and pitting to the chrome. All the lettering on the chassis is good, and I think it would clean up very nice if you’d like to bother.
Some info and specs from the net:
From Wikipedia: Today, 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. 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 preassembled printed circuit board (PCB) containing the driver circuit. It produced 35 watts per channel (wpc). 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 ultralinear design, whereby part of the primary winding is fed back to the output tube's 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 man's McIntosh." More than 350,000 ST-70 amplifiers had been sold when production finally ceased, making the ST 70 the most popular tube power amplifier ever made.
Power output: 35 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 40kHz
Total harmonic distortion: 1%
Damping factor: 15
Input sensitivity: 1.3V
Signal to noise ratio: 90dB
Speaker load impedance: 4Ω to 16Ω
Valve complement: 4 x EL34, 2 x 7199, 1 x GZ34
Dimensions: 13 x 9.5 x 6.5 inches
Weight: 32lbs
Finish: nickel plated chassis, charcoal brown vinyl paint cover
Good Luck, Radioorphanage
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