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6J7

Sensibly equivalent to:
6D7 CV1936 VT-91
See also:
Metal Striptease - The 'Magic Three' Valves - The 'Microamp'
    
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Type 6J7 was originally designed as a detector, but the linear characteristic and good internal shielding (cf. 6Q7GT) made it a natural choice for audio. It was for twenty years the international standard valve for audio amplifier input stages and audio systems.
The Philips-Mullard type EF37A, for many years the standard British low-noise audio pentode, is really a 6J7G under another name. The predecessor valve was the Type 57 and the characteristics are the same.
The maker's name and Made in USA.
The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins, is 63 mm tall.
References: Datasheet, 1040 & 1043. Type 6J7 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
-2
1.0
0.25
1.5M
1.23
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 09, 2017.
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