Ever Wonder what was in that Johnson Amp of yours.  Due to a loose power cord (no fault of the amp) I recently had to do a HARD reset so I pulled the Amp apart and Disconnected the user memory battery for 10 seconds.This not only erased the memory but allowed my amp to function again. I was so happy I didn't have to send it somewhere for service.

Preamp section Nice Tubes eh!!!

Left ones a Sovtek The Right one is a groove tube

Power Supply section (old version)


Back Side of the midi out section


The Battery (Round Object upper right)
I lifted up the contact on the top for a few seconds to erase the user memory

There's a whole lota parts between input and output


S-disk II is the one on the left