Sensibly equivalent¶ to:
The 20P4 is purpose designed as a television line output valve.
In September 1953 Mazda described the 20P4 as having a redesigned g2 with consequent reduction in screen dissipation and increase in power handling on positive pulses. The sensitivity of the valve has also been increased.
The valve can withstand a positive anode surge of 6 kV. The screen grid can dissipate 5 Watts.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 88 mm tall.
References: Data-sheet & 1040. Type 20P4 was first introduced in 1953.
Absolute Maximum Operating Conditions¶
Updated January 30, 2013. shape:wide.glass.tube construction:pinch type:beam.tetrode 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