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VT20

Sensibly equivalent to:
220P CV1020
    
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The VT20 battery triode was designed as an audio output valve. With a maximum output of 190 mW it would be used with headphones and not a loudspeaker.
We have two versions of this exhibit, this one is the earlier of the two and is typically Cossor in shape and is fitted with a standard Cossor base cap of the mid-1930s. The later example of VT20 looks M-OV in shape, despite the Cossor marking, and is fitted with a standard M-OV base cap of WWII period.
The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 84 mm tall.
References: Datasheet & private communication. Type VT20 was first introduced in 1929.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
Pout
2.0
0.2
150
-7.5
11
4,000
2.25
0.19W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December03, 2012.
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