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Hope this helps somebody out...Had this unit and when you plugged anything into any input you would get a hum in the speaker.....If there was nothing plugged in then it was hum free......Found an small inductor on the pre-amp board.....labeled R204.....this was open circuit......and this is the ground for the inputs....Hope this little bit of info helps somebody out in the future.....
Cheers,
Bernie
Cheers,
Bernie