The EF80 internally screened pentode was a workhorse of the VHF TV receiver and was introduced in mid 1950 to replace the EF91. Here we have the EF80A a variant that we can find no data for, and so the EF80 data is presented.
The construction seems to be the same as the regular EF80.
The thin glass tube envelope is 20 mm diameter and excluding the B9A base pins, is 60 mm tall.
References: Data-sheet & 1040.
Absolute Maximum Operating Conditions¶
Updated April 01, 2014. shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.k pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.s pin:7.a pin:8.g2 pin:9.g3