The 504 AC Power Source consists of a basic linear power amplifier with interchangeable plug-in modules. It is designed for continuous-duty operation and utilizes all-silicon, solid-state circuitry. Output for 500 volts-amps of power is available on the front panel and at the rear of the unit. The unit operates in a frequency range of 375 to 425Hz input and 45Hz to 5kHz output
