Sensibly equivalent¶ to:
This exhibit is a Cossor Metal valve but it also says made in USA. On the other side of the envelope it also gives the actual maker as Ken-Rad. Clearly a re-brand for use in Cossor sets.
The 5Z4 was designed to supply equipment of up to 40 Watts total power.
No pretence the Ken-Rad name is proudly presented on the envelope.
The thin metal tube envelope is 25 mm in diameter and excluding the IO base pins, is 67 mm tall.
References: Datasheet, 1040 & 1043. Type 5Z4 was first introduced in 1935.
Absolute Maximum Operating Conditions¶
Updated May 19, 2014. shape:thin.metal.tube construction:glass.disc type:rectifier.fw age:1930.1940 base:io heater:5.0v pins:8 pin:1.m pin:2.h pin:3.nc pin:4.a(2) pin:5.nc pin:6.a(1) pin:7.nc pin:8.h.k