This document contains circuit diagrams for the power supply, preamplifier, and protection/display circuits of a PWP 6000 audio amplifier. The power supply circuit includes transformers, rectifiers, and voltage regulators to produce positive and negative DC voltages for the two amplifier channels. The preamplifier circuit uses operational amplifiers to receive and amplify low-level audio signals for the two channels. The protection/display circuit monitors temperatures, voltages and currents, and includes components for controlling relay switches, LED displays and overcurrent/overtemperature indicators.