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12K7GT

Sensibly equivalent to:
CV918 KTW74M W76
See also:
The 'Magic Three' Valves
    
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The 12K7GT variable-mu screened pentode was designed in the 1940's for intermediate frequency amplifiers in superhet receivers where the stage gain was controlled by the application of negative bias on the grid. That bias or AGC voltage was derived from the received signal by rectification. It is high impedance valve allowing for a high Q in the tuned anode circuit.
See also 6K7.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 67 mm tall.
References: Datasheet, 1040 & 1043.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2
g3
nc
h
k
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
12.6
0.15
250
125
-3
10.5
2.6
0.6M
1.65
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 18, 2013.
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