Marshall Reverb 75 (5275) - Hum issues

Sorry.

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thanks muchly....


what's your take on the input jack and surrounding area, all good? if you can light that area and snap a pic i would appreciate it thanks! reason being that second control is Volume and the first is gain correct? i could be wrong but i think that replacement control may be faulty...or potentially miswired?
 
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The big push pull control (basically pot + simple on off switch) is GAIN. The wired small control (old fix from one of previous owners) is volume. I have measured the volume potentiometer and the value and type seems to be ok. It also works ok.
 
Nope, hum/buzz is not affected by the boost channel volume.

Maybe the prolongation wirec can catch some interference, I can try to unsolder it tomorrow.
 

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