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12SG7

Sensibly equivalent to:
CV694 VT-209
See also:
Metal Striptease
    
Extras ▼

 

The 12SG7 is a 12.6 Volt version of the 6SG7 semi-vari mu pentode. The pins are compatible and the ratings are the same.
The envelope is also marked with the American Government code of VT-209.
The 12SG7 is a variable μ design with a medium gain. It was obsolete by the early 1960s.
The thin metal tube envelope is 25 mm diameter, and excluding the IO base pins, is 50 mm tall.
References: Datasheet, 1040 & 1043. Type 12SG7 was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
k
g1
k
g2
h
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
ra
gm
12.6
0.15
250
150
-2.5
9.2
1M
4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 28, 2013.
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