Carefull, sounds like a potential death trap.
My guess is:
1) The synth isn’t grounded properly. Some loose wire or corrosion probably.
and
2) Leakage from one of the mains lines into the ground. Could be in the transformer, but don’t forget to check the mains wiring/plug itself.
Checking everything with an Ohm meter would be my first priority. Ground pin on the mains plug to the chassis to begin with.
Ben
I have a Polysix that seemed to fry a few channels on an old mixer. I know that this synth works (for the most part) - it boots up fine and produces sound, but when I plugged it into the mixer, it made a momentary god-awful noise as the tip of the TS came in contact with the ground on the synth and the channel died. The synth was plugged into the mains but powered OFF.
I took it downstairs since it needed to be tuned anyway and felt a tiny zap on my arm when the case was open (synth was plugged into the mains but again was turned OFF). I measured roughly 35VAC between the case and a nearby piece of grounded metal. Also measured the same between the case and myself. Unplugged from the mains, I measured nothing of course.
Again, this is all when the synth is powered OFF but plugged into the mains.
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