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The AS4120 is an RF screen grid valve or tetrode from the Tungsram Symphonic range.

The reverse is plain zinc paint and the top cap is missing.

Looking into the top of the valve the rectangle within looks like the screening cage used in similar valves of the period. See MS4B.

The classic envelope is 44 mm in diameter and, excluding the B5 base pins, is 104 mm tall.

References: Data-sheet & Tungsram. Type AS4120 was first introduced in 1933. See also 1933 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.