I remember seeing that problem a long time ago. If there are screws
connected the PCB grounds to the frame, make sure they're tight.

Bob

On 11 Dec 2005 17:02:59 -0800, "
wrote:

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