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CV1052

Sensibly equivalent to:
1637 EL32 OM9 VT52
    
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The CV1052 UK service valve is equivalent to an EL32 audio output pentode. The power is small at 3.6 Watts but more than adequate for single ended audio output stages in receivers. However, they were used in large numbers in telephone repeater amplifiers.
The stamp on the base shell for GPO batch testing shows that this exhibit was intended for repeater service.
The gettering hides the internal structure. For details see EL32.
The wide glass envelope is 29 mm in diameter and, excluding the IO base pins, is 95 mm tall.
References: Datasheet & 1043. Type CV1052 was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
-
h
a
g2
-
-
h
k
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
0.2
250
250
-18
32
5
70k
2.8
3.6
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 26, 2019.
shape:wide.glass.tube construction:pinch type:pentode age:1930.1940 base:io heater:6.3v pins:8 pin:1.- pin:2.h pin:3.a pin:4.g2 pin:5.- pin:6.- pin:7.h pin:8.k pin:tc.g1
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