Recently got a 5150 on the bench... dude said his presence and Resonance went screwy while playing... fixed that, but it had a couple of mods done and I was curious about one of them. Dude bought the amp that way... there is a bias pot mod that looks pretty good... nicely done.... there are bypass wires on R18 and C17...the R18 one I get, they are passing more of the signal to ground to "tighten up" the amp... but what is the purpose of bypassing C17? Thanks in advance for looking...
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