Hum on Optimus STA-20
It may not be the same one I remember, but I had two different hum
problems on some older Realistic receivers.
One had a bad ground connection to the frame from the board to the
screw. Seemed they were using the metal chassis to send the ground to
the different boards.
Another one had a problem if the wiring was not routed correctly.
Having it too close to the transformer would cause the hum.
David
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