I traded a guy a computer for this amp almost 10 years ago now. used it for everything from vocals, to guitar, bass, and even used it as a pa! It always had a bit of crackle in it. At first, it was the cables, then the pots. I took the cover off only to discover I'm probably the first person to open it up since 1971! After a little WD-40, everything came apart nicely, exept the bass pot on the first channel... The nut froze and spun the pot in its case, shredding the internals... Can any one help me get a replacement? I'm not worried about period correctness, just functionality. I love this amp! The good news is that it plays like new again, except I cant adjust the bass on channel 1... Any help appreciated. I'm not an electrician, just a fix it all kinda guy. I can probably solder the new one in if I can find one...