Got two Rats of different generations on the bench for repair. The v2 to the left, not working at all. The other one did not reach unity gain.
I had to replace a malfunctioning jfet source follower on the output stage on the old Rat.
The other one had already been messed with. There were several copper traces on the circuit board that had to be mended, the opamp was burnt and wires not connected. Managed to bring it back to life again.
Got this one in for repair, would not make a sound.
Sometimes it’s an easy fix, when opening the back I found the 12AX7 preamptube at the bottom of the chassie. Just put it back in place and it was ready o rock.
I opened it up and took a look at the circuit. Besides from the single 12AX7 preamptube and the EL84 power tube there’s two JRC4558 opamps on the circuit board, so what we got is a hybrid of solid state and tubes.