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The S4V is an indirectly heated (AC) screened tetrode from 1929. This exhibit is on a B4 base with a side connection for the cathode. The anode is taken to the top cap. The S4V was designed as a screen grid class A RF amplifier as the front end of a radio receiver.

Later variants are the S4VA and S4VB.

See also S4V for a later data-sheet.

The cathode side terminal. In later production of the S4V the B5 base was fitted and the cathode taken to pin 5.

The envelope has etched into it the Mullard aerial, coil and earth logo. This valve is from early in the production.

The balloon envelope is 36 mm in diameter and, excluding the B4 base pins, is 103 mm tall.

References: 1931 data-sheet, ¹⁰⁴³ & hupse.eu/radio/tubes/s4vb.htm. Type S4V was first introduced in 1929. See also 1929 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Andy Cowley for supplying the above PDF datasheet.