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D4

Sensibly equivalent to:
354V 41MHL AC/HL AR17 CV399 CV1037 HL4 MH4 NR31 VR37
    
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This exhibit is a Ferranti D4 triode from the 1930's and was designed for use as a detector or audio voltage amplifier. The valve is indirectly heated and designed for parallel connection and uses the UK 1930's standard of a 4.0 Volt 1 Amp heater.
The balloon envelope is 44 mm in diameter and, excluding the B5 base pins, is 100 mm tall.
References: 1040 & 1043. Type D4 was first introduced in 1933.

 

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
0.65
250
-4.5
6.5
11,500
3.5
Updated February 07, 2013.
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