812A

812A has no equivalent designation confirmed by the archive.

Description

The 812-A is a power triode.

Construction and Ratings

The 812-A has a DC filament voltage of 6.3 volts. Its maximum plate dissipation is 45 watts, with a maximum DC plate voltage of 1125 volts and a maximum AC plate voltage (RMS) of 1750 volts. The maximum DC grid voltage is -125 volts, and the maximum DC grid current is 32 mA. The maximum DC plate current is 160 mA.

Applications and Operating Characteristics

The 812-A is intended for use as an amplifier or oscillator in Class C service, suitable for both continuous commercial service and intermittent commercial and amateur service. The plate shows no color when operated at maximum continuous commercial service ratings, and shows a barely perceptible red color at maximum intermittent commercial and amateur service ratings.

In Class C amplifier or oscillator service with a separate rectified, unfiltered, single-phase, full-wave plate supply, the typical power output is approximately 200 watts. In self-rectifying oscillator or amplifier Class C service, the typical power output is approximately 130 to 190 watts. A typical push-pull circuit operation at 27 Mc uses an AC plate voltage of 1740 volts RMS.

The 812-A can be biased by any convenient method, but the use of a grid resistor is preferred.

Original manufacturer datasheets for 812A, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• **Power Triode**