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220VSG

Sensibly equivalent to:
CV1028 S215VM VR28
See also:
Cossor 2 Volt Range Advert
    
Extras ▼

 

The VR28 is the UK RAF pre-CV code for the commercial 220VSG. This exhibit does not look as if it is a Cossor valve and the RAF requirement would have been for multiple sources of supply..
The datasheet talks of manual control of the bias point. This was at a time before the widespread use of the superhet in UK domestic receivers and the TRF (Tuned Radio Frequency) or straight set was the norm.
The AM and crown. The UK Air Ministry logo.
The balloon envelope is 44 mm in diameter, and excluding the B4 base pins is 105 mm tall.
References: Datasheet & 1043. Type 220VSG was first introduced in 1931.

 

Pin Connections
B4
1
2
3
4
tc
g2
g1
f
f
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.2
150
80
0
2.6
-
110,000
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 24, 2015.
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