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CV491

Sensibly equivalent to:
12AU7 B329 CV4003 E2163 ECC82
See also:
Pin Compatible Double Triodes
    
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The CV491 is a low μ double triode with separate cathodes. An amplification factor of 17 is quoted. The prototype was the 12AU7.
We were surprised at the very low CV number, suggesting availability during WWII but we know that B9A based valves were not made in the UK until the late 1940s.
The KB/FD identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the FD identifies the maker as STC, Rochester.
See also ECC82.
The twin triode sections.
The face of one anode.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
References: Data-sheet & 1040. Type CV491 was first introduced in 1946. See also 1946 adverts.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(2)
g1(2)
k(2)
h
h
a(1)
g1(1)
k(1)
hct

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
gm
6.3
0.3
250
-8.5
10.5
2.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 24, 2024.
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