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CV1091

Sensibly equivalent to:
63SPT ARP35 EF50 POVT207 VR91 VT-250
See also:
The Famous EF50 of WWII
    
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The CV1091 is the service version of the EF50. The CV valves normally had no obvious makers identification, the red paint of this valve suggests a Mullard product.
The valve is a high impedance pentode and was a workhorse of receivers for both radio and especially radar.
The wide glass tube envelope is 32 mm in diameter, and excluding the B9G base pins, is 57 mm tall.
References: Data-sheet & 1040.

 

Pin Connections
B9G
1
2
3
4
5
6
7
8
9
h
g2
a
g3
s
k
g1
s
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
250
-2
10
3
1M
6.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 09, 2013.
shape:wide.glass.tube construction:all.glass type:pentode age:1930.1940 base:b9g heater:6.3v pins:9 pin:1.h pin:2.g2 pin:3.a pin:4.g3 pin:5.s pin:6.k pin:7.g1 pin:8.s pin:9.h
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