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The E425 from Triotron is am audio output triode.

The balloon envelope has the electrodes mounted horizontally.

We have four of the E425's in the museum.

The electrodes mounded above the pinch. The box anode looks to be placed at around 45 degrees.

The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 87 mm tall.

References: Data & ¹⁰⁴³. Type E425 was first introduced in 1932. See also 1932 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶