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The AS4100 from Tungsram is an RF tetrode or screen grid valve as they were called in 1930 when this was issued.

It is described as a Barium valve and this is the Azide process.

Looking at the electrodes it is clearly a screened grid tetrode for RF and IF use in broadcast receivers.

The balloon envelope is 50 mm in diameter and, excluding the B5 base pins, is 115 mm tall.

References: Data-sheet & ¹⁰⁴³. Type AS4100 was first introduced in 1930. See also 1930 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶