ground loop

[spiritledd]

I have ebtech hum eliminators on the 2 Marshall and Randall amps inputs and that stopped hum there ...but the 2 Marshalls share footswitch function "Y jack" and when both are hooked up same time one hums ...unhook that one's footswitch from back and it stops ...what to do short of unhooking that amps ground wire? ...all RG function buttons are used on other things ...runnin wet/dry/wet ...its my center mono amp

 

[rjmmusic]

You really shouldn't share a function switch jack between two amps - a ground loop is the least troublesome problem you'll encounter.

I'd highly recommend using a different wiring arrangement that doesn't try the amp's footswitch grounds together. If for some reason you can't do that, you could possibly cut the ground on one of the 1/4-inch connectors that goes into one amp's footswitch jack.