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CV2390

Sensibly equivalent to:
3A4 CV807 CV2300 DL93
    
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The CV2390 (commercially the 3A4 or DL93) is miniature output pentode is specified for both audio and transmitter use. For a small dry battery valve 1.2 Watts output in the HF range would be quite an achievement.
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 anode covers the internal structure.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 47 mm tall.
References: Data-sheet & 1040. Type CV2390 was first introduced in 1957. See also 1957 adverts.

 

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
165
150
-8.4
13.3
2.2
100,000
2.0
0.7
6%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 08, 2025.
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