Receiver has a hum - Harmon Kardon 230A
One point hasn't been brought up.
If one or more of the caps are bad, then it's likely you'll hear hum even
with the volume control all the way down. If there is no hum with the
control the way down, the problem is probably elsewhere.
Regardless, it wouldn't be a bad idea to simply replace all the PS
electrolytics in a 35-year old receiver.
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