Ok, I drew up some schematics. I couldn't put the whole thing on one page so I did it in sections that interconnect. I might try to tape 4 blank pages together to see if i could get the whole thing in one place but for now this is what I got. Sorry for the messy drawings, i'll try to clean them up tomorrow. I don't see any mods and I don't really get the photo cell vibrato circuit and how it works with the 2nd channel preamp section. maybe some one here could explain it to me. Also, I don't see how the reverb circuit blends with the 2nd channel. maybe someone who is familiar with reverb circuits could explain that one. Phase inverter looks normal as does the power section/ power supply. Anyways, I got rid of the motor boating . Put shielded wires on the 2nd channel input and replaced a couple of the brown .05uf caps off the plates but the hum is still there. Not sure if that photo cell is the cause of it or not? Maybe some kind of ground loop Any ideas would be appreciated.
supro vibra verb 1965 schematic in sections
supro vibra verb 1965 schematic in sections
Comment