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12K7GT

Sensibly equivalent to:
CV918 KTW74M W76
See also:
The 'Magic Three' Valves
    
Extras ▼

 

The 12K7GT variable-mu screened pentode designed for intermediate frequency amplifiers in superhet receivers where the stage gain was controlled by the application of negative bias on the grid.
The outer screen is connected to the lower screen.
Within the screen can be seen the anode and wire grids.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 71 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 March 05, 2015.
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