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12SJ7

Sensibly equivalent to:
CV697 VT-162
See also:
Metal Striptease
    
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The 12SJ7 is a high gain amplifier pentode and is the 12.6 Volt heater version of the 6SJ7. The S in the Type designation tells us that it is a single ended valve ie no top cap. The 12J7GT shows a glass tubular version with the control grid taken to the top cap for good isolation between anode and grid circuits.
Design use is as a Class A amplifier, so good for audio with its excellent linear characteristic curve.
The 12SJ7 is also equal to the US Government Type VT-162 and both exist on this RCA valve.
The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 57 mm tall.
References: Datasheet, 1040 & 1043. Type 12SJ7 was first introduced in 1939.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
g3
g1
k
g2
h
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
12.6
0.15
250
100
-3
3
0.8
1M
1.65
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 11, 2017.
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