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6SN7GT

Sensibly equivalent to:
13D2 B65 CV1988 VT-231
    
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This 6SN7GT double triode valve is marked as US Navy and does not have a makers name. Observation shows that visually it matches the RCA 6SN7GT.
Normally US service valves would be marked with a VT code, in this case the VT-231.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 67 mm tall.
References: Datasheet, 1040 & 1043. Type 6SN7GT was first introduced in 1941.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
g1(2)
a(2)
k(2)
g1(1)
a(1)
k(1)
h
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.8
250
-0
3
7.7k
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 11, 2015.
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