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12AX7B

Sensibly equivalent to:
12DT7 6057 6L13 B339 CV492 E2162 ECC83
    
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The B suffix on this 12AX7 denotes a different construction from the 1940s original design. This exhibit is in 2015 an example of current manufacture, in this case Chinese, for the valve audio market.
The bright structure on the left is part of the electrostatic screen between the triodes.
The anodes are boxes that are wider than the original design. This increased spacing will change the anode AC resistance.
The thin glass tube envelope is 22 mm in diameter, and excluding the B9A base pins is 50 mm tall.
References: Datasheet, 1040 & 1043.

 

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 18, 2015.
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