Summary

Beam tetrode designed for use in radio transmitters requiring valves with a rapid warm-up. It has similar characteristics to type 807 but its directly heated cathode allows it to be used within a second or so of turning on the filament supply.

2.5 V directly heated cathode. Used as a Class AB1 amplifier. Manufactured by Ken-Rad, Owensboro, KY, USA.

The rapid warm-up time allowed the filaments to be turned off when the transmitter was not in use. This gave a substantial power saving in transmitters used in mobile communications that are transmitting for relatively short periods.

Physical Description

Large shouldered glass bulb with top cap and five pin UY style base.

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