A tetrode, manufactured by Philips, probably in Holland, introduced in 1932. It was used as a radio frequency amplifier.

It is a remote cut-off type and uses 2 Volts at 180 mA, with a directly heated cathode.

Tetrode (or screen grid tube) was used in high frequency amplification. Feed back from anode to control grid was virtually eliminated by uising a screen grid between them. Remote cut-off characteristic improves handling of large signals and facilitates the use of automatic volume control.

Physical Description

Four pin base with top cap.

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