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VR83

Sensibly equivalent to:
210VPT ARP13 CV1083 NR41 VP21
    
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The VR83, is a vari-μ HF metallised pentode used by the RAF for radio receivers. The prototypes were the 210VPT and VP21. After 1941 with the advent of the Common Valve register it became the CV1083. Other pre-CV names were - ARP13 for the Army and NR41 for the Admiralty. The CV specifications made Government procurement more efficient.
The service arrow. The screw top cap dates this to the early 1930s.
The classic envelope is 45 mm in diameter and, excluding the B7 base pins, is 73 mm tall.
Reference: Data-sheet.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
m
g1
g3
f
f
-
g2
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.1
150
80
0
2.9
0.75
0.6M
1.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 16, 2021.
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