07-18-2017, 01:52 AM
dkirk,
I apologize for my radio silence, had a family emergency and wasn't checking the forum.
one thing about old ampegs, they rarely match the schematic. The owner Everret Hull was infamous for doing custom builds for well known jazz musicians, and if the circuits were constantly in flux. Your amp does seem to be a very unique example of this.
The Joe Piazza schematics are awful. Don't use them. The schematic you have shown only uses 6 tubes, but two of the tubes are triple triodes. which means you have two unaccounted for triodes. This couldn't be very similar to yours. I've added a new schematic under the docs section "R12R Reverberocket"
The first one should be pretty similar
I would focus on the fact that you have no plate voltage on your phase inverter. can you measure any voltage on the other side of the plate resistor?
what about power supply point C?
I apologize for my radio silence, had a family emergency and wasn't checking the forum.
one thing about old ampegs, they rarely match the schematic. The owner Everret Hull was infamous for doing custom builds for well known jazz musicians, and if the circuits were constantly in flux. Your amp does seem to be a very unique example of this.
The Joe Piazza schematics are awful. Don't use them. The schematic you have shown only uses 6 tubes, but two of the tubes are triple triodes. which means you have two unaccounted for triodes. This couldn't be very similar to yours. I've added a new schematic under the docs section "R12R Reverberocket"
The first one should be pretty similar
I would focus on the fact that you have no plate voltage on your phase inverter. can you measure any voltage on the other side of the plate resistor?
what about power supply point C?