Sensibly equivalent¶ to:
The indirectly heated triode Type 904V is described by Mullard as a high magnification detector. The data-sheet gives details of operation as both detector and as an LF (audio) amplifier.
The Dome carries the identification.
Thanks to Mark Mallison for sending the images.
The balloon envelope measures mm in diameter and the excluding the B5 base pins, is mm tall.
References: Datasheet & 1043. Type 904V was first introduced in 1931.
Absolute Maximum Operating Conditions¶
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated December06, 2019. shape:balloon construction:pinch type:triode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.a pin:2.g1 pin:3.h pin:4.h pin:5.k