Output pentode, used as a Class A power output amplifier and a Class AB1 amplifier.
Philips developed the pentode (they spelled it penthode) for audio output applications in 1927. The E443N was released in 1928; it was designed for AC operation and could produce an output of over 5 watts with a plate supply of 400 V. It was replaced soon after by the E443H which could produce an adequate output with a more convenient 250 V supply.
Manufacturer: Philips, Holland.
4 V directly heated cathode.

Physical Description

Conical bulb with 5 pin UY style base.

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