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6J7GT

Sensibly equivalent to:
CV1937
See also:
The 'Magic Three' Valves - The 'Microamp'
    
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Type 6J7 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.
It was for two decades the international standard valve for audio amplifier input stages and audio systems generally. The Mullard-Philips type EF37A, for many years the standard British low-noise audio pentode, is really a 6J7G under another name.
The 12J7GT is the same valve but fitted with a 12.6 Volt heater.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 74 mm tall.
References: Datasheet, private communication & 1040. Type 6J7GT was first introduced in 1936.

 

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 October 28, 2013.
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