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12AX7

Sensibly equivalent to:
12DT7 6057 6L13 B339 CV492 E2162 ECC83
See also:
Mullard's ECC83 - A New 25W Audio Output Pentode - Valves and their Habits - Pin Compatible Double Triodes - Transformerless Amplifiers
    
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The 12AX7 is a high impedance amplifier triode and equivalent to the Mullard ECC83 where full details can be found. Colomor imported and distributed foreign valves.
The anodes are folded and stitch on one side. This flange provides additional heat sinking and a point to attach the support.
The central column is a support for the getter holder.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 48 mm tall.
References: Data-sheet, 3002 & 1040. Type 12AX7 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 September 14, 2020.
shape:thin.glass.tube construction:all.glass type:double.triode age:1940.1950 base:b9a heater:6.3v pins:9 pin:1.a pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.a pin:7.g1 pin:8.k pin:9.hct
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