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12SG7

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

 

The American Government code of VT-209 is also the commercial 12SG7. It is a 12.6 Volt version of the 6SG7 semi-vari mu pentode except for the heater they are identical. Brimar are in this instance the UK distributor and not the manufacturer.
The reverse is plain paint over the steel envelope.
The thin metal tube envelope is 25 mm diameter, and excluding the IO base pins, is 52 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 January 13, 2017.
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