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NR83

Sensibly equivalent to:
6J7G ARP16 CV1074 KTZ63 VT74
See also:
The 'Magic Three' Valves
    
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This valve is badged as a Navy receiving valve, an NR83. Unlike most valves supplied for government service this exhibit is also clearly labelled with the commercial Type 6J7G.
The 6J7G 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. 6Q7G) 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.
A close look under the outer screening fails to reveal any detail.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 95 mm tall.
References: Private communication & datasheet.

 

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 January 02, 2013.
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