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12Q7GT

Sensibly equivalent to:
DH76 DL74 DL74M
    
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The 12Q7GT double diode triode was designed for receiver audio use.
The diodes would be for signal and AGC rectification and the triode would act as AGC amplifier or first audio amplifier.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 70 mm tall.
References: Datasheet, 1040 & 1043. Type 12Q7GT was first introduced in 1947.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
a(d2)
a(d1)
nc
h
k
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
12.6
0.15
250
-3
1
58k
1.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 28, 2013.
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