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12AH7GT

Sensibly equivalent to:
CV529 VT-207
    
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The 12AH7GT has two independent audio triodes within the envelope. The triodes are low impedance, low gain types similar to the ECC82 in ratings.
A view of the triodes seen end on. The 12AH7GT is equivalent to the VT-207 American government specification.
The two triodes are identical and the stitched anodes clamp to the support rods.
The glass looks perfectly clear but close-up there are many imperfections.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 62 mm tall.
References: Datasheet, 1040 & 1043. Type 12AH7GT was first introduced in 1941.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
g1(1)
k(1)
a(1)
k(2)
g1(2)
a(2)
h
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
12.6
0.15
250
-9.0
12.0
6,600
2.4
16
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 11, 2015.
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