![]() ![]() Since everything seems to be working they don't seem to be causing problems but I can't figure out what they're for. One is on the bias pot & the other is on the tremolo footswitch jack. There's two electrolytic caps in this chassis that don't appear on either a AB763 or AB868 schematic. Serial number dating & tranny date codes show this to be a 1975 amp. The tremolo issue turned out to be the 12AT7 in V5 so replacing the tube has got that working now. Anyway I fired it up last week & besides the tremolo not working it sounds surprisingly healthy. ![]() It doesn't get played much, it's been mostly ignored. I acquired this amp about 20 years ago & other than replace filter caps have never bothered with it much.
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