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.
Absolute Maximum Operating Conditions¶
Updated January 18, 2013. shape:classic 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