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12J7GT

Sensibly equivalent to:
CV917
See also:
The 'Magic Three' Valves
    
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Type 12J7 is a contemporary of the Magic Three and almost as ubiquitous. Although originally designed as a detector its linear characteristic and good internal shielding (cf. 6Q7) made it a natural choice for audio.
This exhibit has a 12.6 volt heater but other wise is identical to the 6J7GT. The latter was for two decades the international standard valve for audio amplifier input stages and audio systems generally.
The Brimar (BRItish Made American Range) logo of STC.
A part view of the three wire grids.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 73 mm tall.
References: Datasheet & 1040.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-3
2.0
0.5
1.5M
1.25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 01, 2012.
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