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VT-91

Sensibly equivalent to:
6J7
See also:
Metal Striptease - The 'Magic Three' Valves - The 'Microamp'
    
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Type American service Type VT-91 (commercially Type 6J7) is a contemporary of the 'Magic Three' and the design almost as ubiquitous. Although originally made as a detector its linear characteristic and good internal shielding (cf. 6Q7GT) made it a natural choice for audio.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 thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 62 mm tall.
References: Datasheet, 1040 & 1043. Type VT-91 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 October 28, 2013.
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