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Sam Goldwasser
 
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Default Hum on Optimus STA-20

" writes:

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.


I suppose this is a possibility.

Another one had a problem if the wiring was not routed correctly.
Having it too close to the transformer would cause the hum.


There is very little wiring to route inside and no one's been in there
before me so I doubt that's it.

Thanks.

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