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220VSG

Sensibly equivalent to:
CV1028 S215VM VR28
See also:
CV1028 short entry - Cossor 2 Volt Range Advert
    
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The 220VSG was the first variable-μ valve introduced by Cossor and dates to 1931. 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 zinc paint screening is connected to the base pins by the wire that connects to the disc shown. Corrosion can be seen near the top.
Before the introduction of the 'top hat' top cap the screw cap was in use. The zinc paint extends over the base of the plastic cap. The screw top is missing in this exhibit.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 107 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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