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6Q7GT

 
See also:
The 'Magic Three' Valves
    
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The Tungsram 6Q7GT is a commercial double diode triode designed for receiver audio use.
The diodes would be for signal and AGC rectification and the triode would act as AGC amplifier or first audio amplifier. This is a miniature glass tubular version of this valve, we also have the older version with the classic glass envelope.
The triode at the top, with the grid visible, and the bright screening box housing the two rod anodes for the signal diodes.
The broken spigot reveals the evacuation pip from the centre of the hard glass foot that holds the connections and electrodes.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 72 mm tall.
References: Data-sheet, 1040 & 1043. Type 6Q7GT was first introduced in 1936.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-3
1
58k
1.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 18, 2020.
shape:wide.glass.tube construction:glass.foot type:double.diode.triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.a(d2) pin:5.a(d1) pin:6.nc pin:7.h pin:8.k pin:tc.g1
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