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CV807

Sensibly equivalent to:
3A4 CV2390 DL93 E1485
    
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The CV807 miniature output pentode is specified for both audio and transmitter use. The CV807 is the same as the commercial 3A4 and the envelope has both Type designations. For a small dry battery valve 1.2 Watts output in the HF range would be quite an achievement. Clandestine radio springs to mind.
The KB/D identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the D identifies the maker as Mullard Radio Valve Co., Mitcham.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 44 mm tall.
References: Data-sheet & 1040.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f-
a
g2
g1
fct
a
f+

 

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
1.4
0.2
150
90
-8.4
13.3
2.2
100,000
1.9
0.7
6%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 25, 2024.
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