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Yeah, I found a bad cathode bypass cap

I’m the single Rec V3b is the cathode follower/tone stack driver. After the tone stack it goes straight to the fx loop V4 a: driver b: recovery. When you have a cathode driven tone stack you don’t necessarily need a recovery stage.

I didn’t feel it was necessary to be honest. Just that one mod did what I thought the amp needed. Always make one change at a time

It’s actually pretty simple, after the first gain stage there’s usually a 0.02 capacitor. Buy changing that to a 0.002 we’re taking off way more low end before it hits the next gain stage. This makes it so much tighter. I also means we can turn the bass control up to compensate without it...

Ah mate, I’ve been super busy to check on my socials. Just catching up. Sent you the discord link. Looks like you found what you needed but still happy to help.

My studio preamp just started sounding weird, opened it up to chop stick it and the board was super microphonic, took out the tubes and checked the plates. Over 500v!!!! Anyone else had something similar happen?