Dynaco ST-70 Tube stereo audio amplifier Bad AC hum in both Channels What is causing the fault?
YouTubeD-lab Electronics
Dynaco ST-70 Tube stereo audio amplifier Bad AC hum in both Channels What is causing the fault?
A local fellow brought to the shop last weekend. He has owned the amp for a few years, used to play beautifully. Then recently it developed a bad AC hum in both channels. He had tried a few things to correct the problem, but then decided it best to bring it to me. The amp had a replacement driver board (VTA) new tubes and filter cap replacement ...
13.7K viewsJul 2, 2023
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