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OK, 0.022 uF is TOO BIG - current safety standards don't allow more than 0.7 mA leakage to chassis - this works out to 0.015 uF MAXIMUM. The 1 meg resistor is NOT a safety approved part, and an old cap is probably leaky. I would replace the cap with a .01 uF safety approved part (Y-capacitor with UL safety label) and eliminate the 1 meg resistor.
I just found the schematic for the amp... even worse! C19 is a .047 uF capacitor from line to ground. I suppose they expected you to just flip the plug over if you get a shock from the chassis - again, you MUST replace this with a smaller value, safety rated part - 0.01. C3 likewise is .047 uF, from line to the tonearm shield - reduce to 0.01.
It is possible (but unlikely) that the transformer has leakage to ground - you'd need an insulation resistance tester (I use my Sprague TO-4 cap checker) to measure it.
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