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CV492

Sensibly equivalent to:
12AX7 B339 CV4004 E2164 ECC83
See also:
Mullard's ECC83 - A New 25W Audio Output Pentode
    
Extras ▼

 

The CV492 is the 12AX7 high impedance amplifier triode. The design has a high amplification factor of 100. The RCA data-sheet says the valve is suited to RC-coupled amplifiers, multi-vibrators and industrial control.
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 face view of one anode.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 45 mm tall.
References: Data-sheet, 3002 & 1040. Type CV492 was first introduced in 1947. See also 1947 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
ra
gm
6.3
0.3
250
-2
1.2
62.5K
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 24, 2024.
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