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VR21

Sensibly equivalent to:
210LF AR9 CV1021 CV1307 L21 L2
See also:
CV1021 short entry
    
Extras ▼

 

The VR21 (later called the CV1021) is a battery triode as supplied to the Royal Air Force. The VR stands for Valve Receiving.
The filament is in the form of an M with two tension springs at the top and a fixed support for the lower central loop. The grid extends to just outside of the bright anode.
The side view shows the front to back dimension to be around four mm.
The balloon envelope is 42 mm in diameter and, excluding the B4 base pins, is 87 mm tall.
References: Datasheet & 1040. Type VR21 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
2
0.1
120
-6
7.5
7000
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 15, 2018.
shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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