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The 20P1 is a purpose designed self oscillating television line output valve. It is designed to withstand a positive anode surge voltage of 6 kV and a negative grid surge of -1.5 kV. The screen grid can dissipate 5 W.

This valve would be seen in television receivers of the 1950s.

The classic envelope is 50 mm in diameter and, excluding the IO base pins, is 120 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 20P1 was first introduced in 1951. See also 1951 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.