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12AX7

Sensibly equivalent to:
12DT7 6057 6L13 B339 CV492 E2162 ECC83
See also:
Fujitsu 12AX7 Box - Transformerless Amplifiers
    
Extras ▼

 

The 12AX7 high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100. The original American 12AX7 design was copied by many companies. Here we have a Japanese version of late manufacture.
The brand name of the valve is TEN and the identification being in English and Japanese indicates the international sales.
The anode face view.
The anode space is quite deep front to back.
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 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 June 12, 2013.
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