Electro-Voice 4PM35 is a high-fidelity amplifier designed for various applications, including background music, public address, and high-fidelity systems. It features a high gain input for microphones and separate inputs for tuners, ceramic or crystal cartridges, each with individual controls. The tone control allows for sound customization, while the pilot light and external fuse receptacle enhance safety and convenience. With speaker output impedances of 4, 8, and 16 ohms, and output lines of 25 volts and 70 volts, it provides versatility for different speaker configurations.