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CV4009

Sensibly equivalent to:
5749 6BA6W CV454
    
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The CV4009 is a special quality version of the CV454 and is also known as the 5749 and the 6BA6W. It is a variable μ pentode for use at HF. Most probably as RF amplifiers in radio receivers.
The KB/AD identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the AD identifies the maker as Brimar - Thorn-AEI , Rochester.
The thin glass tube envelope is 17 mm in diameter and excluding the B7G base pins, is 45 mm long.
Reference: Data-sheet. Type CV4009 was first introduced in 1956. See also 1956 adverts.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
g3,s
h
h
a
g2
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
gm
6.3
0.3
250
100
-1
11
4.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 02, 2024.
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