Под БП я имел ввиду не внешний (трансформатор), а схему внутри (PSU) - с диодами и лин.регуляторами:
2.0 Power Supply
The power supply begins with the 9 Volt A.C., adapter (Alesis P2 type). Input from J6 is R.F. filtered by C1. From there it is split for the +12V, -12V, and +5V rails.
The +12V...