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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 thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 44 mm tall.
References: Datasheet & 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
mAa
mAs
Pdiss
Pout
freq
1.4
0.2
150
135
18.3
6.5
2W
1.2W
50MHz

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAs
ra
gm
Pout
D
1.4
0.2
150
90
-8.4 mAa_13.3
2.2
100,000
1.9
0.7
6%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 08, 2013.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:1.4v pins:7 pin:1.f- pin:2.a pin:3.g2 pin:4.g1 pin:5.fct pin:6.a pin:7.f+
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