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.
See 20P1 for the original classic envelope version. Although a more modern design, possibly for replacement use, the valve is still assembled on a standard pinch.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 90 mm tall.
References: Datasheet & 1040. Type 20P1 was first introduced in 1951.
Absolute Maximum Operating Conditions¶
Updated January 18, 2013. shape:wide.glass.tube construction:pinch type:pentode age:1950.1960 base:io heater:200ma pins:8 pin:1.- pin:2.h pin:3.- pin:4.g2 pin:5.g1 pin:6.- pin:7.h pin:8.k pin:tc.a