783-A

The General Radio 783A is an Output-Power Meter introduced in 1944 Catalog K3. It remained available through Catalog Q 1961.

General Radio 783-A

output-power meter General Radio 783A Output-Power Meter Available from 1944 to 1961 Manuals General Radio 783A Output-Power Meter Manual 548F (1967) (OCRed) (All manuals in PDF format unless noted otherwise)

The 783-A is acts as an adjustable load impedance, with a voltmeter calibrated directly in watts dissipated in the load. It can safely handle 100 W at audio frequencies. It can be used to test amplifiers, transformers, oscillators, filters, and similar networks.

CAUTION: This device contains asbestos.

Specifications

Power Range: 0.2 mW to 100 W in five ranges.
Impedance Range: 2.5 to 20,000 Ω.
Power Accuracy: ±0.25 dB at full-scale reading. Overall frequency characteristic of power indication is flat within ±0.5 dB from 20 to 10,000 Hz; within 0.75 dB to 15,000 Hz.

Links

Experimenter February 1942 describing 783-A (OCRed)

Photos

Asbestos Insulator