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CV492

Sensibly equivalent to:
12AX7 B339 CV4004 E2164 ECC83
    
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The CV492 is the ECC83 high impedance amplifier triode. The design has a high amplification factor of 100. The envelope carries the CV designation and the American Type designation of 12AX7 indicating direct equivalence.
The other side of the glass shows that this is a standard production Mullard ECC83.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
References: Datasheet, 3002 & 1040. Type CV492 was first introduced in 1947.

 

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 March 04, 2015.
shape:thin.glass.tube construction:all.glass type:double.triode age:1940.1950 base:b9a heater:6.3v pins:9 pin:1.a(2) pin:2.g1(2) pin:3.k(2) pin:4.h pin:5.h pin:6.a(1) pin:7.g1(1) pin:8.k(1) pin:9.hct
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