Mine has developed a bit of a hum, full story here. Revox G36 noise/hum on recordings. - Tapeheads Tape, Audio and Music Forums
It's still in bits but I have cleaned the switch contacts, is there anything else worth looking at before I reassemble it?
It's possible, depending on the circuitry. It would be at a constant 100 Hz hum/buzz.
At any rate, it's due for refreshing.
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I decided to assemble it enough to get it running safely, basically without the front cover, it ran beautifully, no noise, recorded lovely with no noise so I let it run for a while. I was sure it was fine, put the front face plate back on and its humming again, sods law.
With the panel off, try touching a wire between various pairs of chassis screw holes
for the panel, to see if it causes hum. Attaching the panel may be causing a ground loop.
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