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104V

Sensibly equivalent to:
CV1160 CV1161 NR27 NR27A
See also:
Valves at the 1929 Olympia Show
    
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The Mullard 104V is an output triode of a type known as 'super power' back in the 1920s. The UK Navy used the 104V as a NR27 and with the advent of the 1941 Common Valve list it became the CV1160 for UK government procurement.
The makers name and basic operating details are etched into the dome of the envelope.
Thanks to Mark Mallison for sending the images.
The balloon envelope is 51 mm in diameter, and excluding the B5 base pins is 115 mm tall.
References: Datasheet, & 1043. Type 104V was first introduced in 1929.

 

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
μ
4.0
1.0
200
-12.0
17.0
2,850
3.5
9.5
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated December16, 2018.
shape:balloon construction:pinch type:triode age:1920.1930 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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