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12BH7A

 
See also:
National Electronics 12BH7A Box - Double Triodes and Guitar Amplification
    
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The 12BH7A is a modern variant on the original 1950s design of double triode. Originally the valve was designed for use in television vertical deflection stages as well as a Class A voltage amplifier.
The A variant of the 12BH7 has a defined warm-up time of 11 seconds.
The National Electronics lettering is supplementary to the original Type designation. The presence of the pattern of dots suggests that the manufacturer was General Electric.
The two long triodes with the grids visible through the holes in the anode sides.
The National Electronics logo.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 59 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
μ
12.6
0.3
250
-10.5
11.5
5,300
3.1
16.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 19, 2018.
shape:thin.glass.tube construction:all.glass type:double.triode base:b9a heater:12.6v 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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