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CV2721

Sensibly equivalent to:
6CJ6 EL81
    
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The CV2721 is the EL81 badged for the UK Government. It was designed as a television line output stage valve from the era of monochrome 405 line VHF television. The CV2721 is specified for a peak positive anode surge of 7,000 Volts.
See also PL81
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 71 mm tall.
References: Data-sheet & 1040.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
tc
ic
g1
k
h
h
ic
ic
g2
g3
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
Pdiss
6.3
1.05
250
250
-1
32
2.4
8.0W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2013.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.ic pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.ic pin:7.ic pin:8.g2 pin:9.g3 pin:tc.a
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