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FA: Dynaco ST-70 Tube Amplifier/Upgraded
Dynaco ST-70
This is a Dynaco Stereo 70 amplifier in beautiful cosmetic condition and great working order. I'm the second owner (my Dentist was the first) of this amp and have been using it for the last year. I have thoughtfully upgraded to retain the original circuitry and famous sonic signature of the ST-70 using the 7199 driver tubes. All out of spec resistors have been replaced and matched to 1%, along with new polypropylene coupling caps, a diode replacement of the selenium rectifier, and a rebuilt bias supply. Additional capacitance (Sprague Atoms) has been added to stages two and three of the original filter cap, in other locations WIMA poly caps have been used. Finally, Gold RCA's have been fitted to the inputs with wider spacing to allow the use of larger RCA plugs. There have been no chassis modifications. I have checked the voltages and all match the original Dynaco specs; the tubes have also been tested on my TV-7 D/U. The outputs are EL-34 matched pairs from Tube Depot. The amp sounds wonderful and is extremely quiet with no hum. This is the classic tube amp to have if you like classical and vocal pieces...the midrange is impressive. Thank you for looking---and check my other auctions. http://cgi.ebay.com/ws/eBayISAPI.dll...MESE%3AIT&rd=1 |
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