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12AX7

Sensibly equivalent to:
12DT7 6057 6L13 B339 CV492 E2162 ECC83
See also:
Brimar 12AH8, 6BA6, 6AT6, 12AX7 & 6AQ5 Advert - Brimar 25P1 Amplifier - 11 Watt Ultra-Linear Amplifier - Transformerless Amplifiers - Mufax Chart Recorder Maintenance Manual
    
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The 12AX7 high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100. This is an american design that was copied by other companies. Mullard describe the ECC83 (=12AX7) as a high μ double triode, having separate cathodes, primarily intended for use as a resistance-coupled amplifier or phase inverter.
In this Brimar exhibit the BVA logo takes centre stage. In 12AX7 the BVA are relegated to the back - and just letters.
The twin triose sections with side flanges at the ends of the grid winding. In a power valve the flanges would be on the working face to assist with heat dispersal.
Made in England.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 mm tall.
References: Datasheet, 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 January 24, 2017.
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