im building an unusual mad scientist combo using two "preamps" that are actually 10w amps with the blown op amp power chips removed. i just use what was the signal imput to those op amps as my line out to a power amp. generally works pretty good. in this case im trying to use two of them to make a 2ch and a/b between them BUT theyre not getting along. im also using an old starforce power amp section from another dead amp.
when its all hooked up to test it im getting a loud open ground type hum when i touch the strings of (any) guitar. it only does it with one preamp and not the other. its not the cord or the guutar and ive tried swapping the ac mains and lifting grounds etc etc and can only make it worse.
the preamps are a squire champ 15 and a fender frontman. the frontman is the humnmer but the champ and the starforce have given me compatibility noise issues before.
anybody have a clue what im talking about?
when its all hooked up to test it im getting a loud open ground type hum when i touch the strings of (any) guitar. it only does it with one preamp and not the other. its not the cord or the guutar and ive tried swapping the ac mains and lifting grounds etc etc and can only make it worse.
the preamps are a squire champ 15 and a fender frontman. the frontman is the humnmer but the champ and the starforce have given me compatibility noise issues before.
anybody have a clue what im talking about?
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