The RCA jacks were also heavily corroded and cleaned. I found some bad Op-Amps, one 1/4 audio jack was broken and replaced. The pcb holding the 3 control leds was broken and fixed. New heatsink compound was applied.
Erath/Ground wire was not connected and that's a serious safety issue. For me a no go, so I fixed that. Please, do not disconnect earth from a metal hosing ! (IEC protection classes)
Like always in such restoration everything was cleaned properly (housing, switches, potentiometers, connectors, jacks, heads (demagnitized), bearings, pinch roller, ... bad solderjoints reflowed...
A new tape loop was installed.
A lot of work, but quite worth it. It is a great sounding chorus/reverb/echo.
Calibration was also performed on this beauty.