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904V

Sensibly equivalent to:
41MTL AC2/HL HLA2 MH41
    
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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.

 

Pin Connections
B5
1
2
3
4
5
a
g1
h
h
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
4.0
1.0
200
-2.0
1.8
34.000
2.2
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
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