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6SQ7GT

Sensibly equivalent to:
CV1991
See also:
The 'Magic Three' Valves
    
Extras ▼

 

The 6SQ7GT/G is a double diode triode. 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.
The triode is at the top with the diode anodes housed in the bright screen below.
Side view.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 64 mm tall.
References: Datasheet, 1040 & 1043. Type 6SQ7GT 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 December10, 2019.
shape:wide.glass.tube construction:pinch type:double.diode.triode age:1930.1940 base:io heater:12.6v pins:8 pin:1.m pin:2.g1 pin:3.k pin:4.a(d2) pin:5.a(d1) pin:6.a pin:7.h pin:8.h
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