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12AX7EH

Sensibly equivalent to:
12DT7 6057 6L13 B339 CV492 E2162 ECC83
    
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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 many other companies.
The 'EH' suffix appears to just identify the brand. Double mica sheets are present as would be found on military and aviation valves subject to vibration.
The twin triode sections follow the original pattern of no central screen.
A three quarter view of the anodes.
One triode seen face on.
The thin glass tube envelope is 22 mm in diameter, and excluding the B9A base pins is 48 mm tall.
Reference: Datasheet.

 

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 November 14, 2018.
shape:thin.glass.tube construction:all.glass type:double.triode age:post 1975 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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