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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
0.6
250
-8
9
7.7k
1.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 11, 2015.
shape:wide.glass.tube construction:pinch type:double.triode age:1940.1950 base:io heater:6.3v pins:8 pin:1.g1(2) pin:2.a(2) pin:3.k(2) pin:4.g1(1) pin:5.a(1) pin:6.k(1) pin:7.h pin:8.h
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