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6SQ7

Sensibly equivalent to:
6G2 6R17B CV1990 VT-103
See also:
Metal Striptease
    
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The 6SQ7 is a double diode triode sharing a common cathode, designed in the early 1940s specifically for superhet receiver use. The diodes would act as signal detector and AGC detectors, while the triode would be the first stage audio voltage amplifier.
The thin metal tube envelope is 25 mm in diameter and excluding the IO base pins the valve is 50 mm long.
References: Datasheet, 1040 & 1043. Type 6SQ7 was first introduced in 1938.

 

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
6.3
0.3
250
-2
0.9
91K
1.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 25, 2013.
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