I have a old Dynaco ST-70, what to do. Put new caps and tubes, maybe a new board. Should you leave it stock and up-grade parts or modify it. If so what kind of modification?
Since you know a lot about the ST-70, I will ask you if it normal for them to have a chasis hum, not audible in the speakers but directly from the chasis? I can hear mine from 20 feet away when the music is very soft.
Thanks to all who answered my question about chasis hum in the ST-70. It turns out there was an open circuit in the rectifier, which was fixed by adding a diode in the path. Now it is quiet again and I have sold it.
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