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Hi folks. My Thorens, which I've been using for quite a long time, has developed a new hum (through the speakers) and I'm having trouble diagnosing it. (Previously I had a hum that was due to tonearm grounding, but this is something different.)
The hum comes and goes almost at random. The hum can start for no apparent reason (I first noticed it when my son lifted the tonearm last weekend). Sometimes I can make it go away by cycling the power off and on. BUT SOMETIMES THE HUM REMAINS, EVEN WITH THE POWER SWITCHED COMPLETELY OFF! Sometimes cycling it works, sometimes it doesn't. So, while it seems to involve the switch, but it doesn't seem to involve the motor, or at least not directly. And sometimes it will come back again, even if I don't touch the switch again. And sometimes cycling the power has no effect...which is to say, I have to do it two or three times to get rid of the hum.
So the power switch is involved, but I really can't see how. I'm most mystified by the fact that, though it involves the switch, it can occur even with the power to the motor off.
Anyone else experienced this? What was your solution?
Thanks,
Jim
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