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12SQ7

Sensibly equivalent to:
CV546 VT-104
See also:
The 'Magic Three' Valves - Ferranti 12SQ7 Box
    
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The 12SQ7 is a double diode triode with heaters designed to operate from the 12.6 volts available in a vehicle.
The diodes are for AM signal detection and AGC detection whilst the triode section is for first audio amplification. This is typical for a valve used in a radio superhet receiver.
Apart from the 12.6 volt heaters the valve characteristics are equal to the 6SQ7.
The reverse is plain black.
The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 51 mm tall.
References: Datasheet & 1040. Type 12SQ7 was first introduced in 1939.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
g1
k
a(d2)
a(d1)
a
h
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
12.6
0.15
250
-2.0
0.9
91,000
1.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 24, 2013.
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