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6K8GT

Sensibly equivalent to:
CV1946
See also:
The 'Magic Three' Valves
    
Extras ▼

 

The 6K8GT was purpose designed for radio as a mixer or frequency changer with the signal input to the top-cap. Here we have an unbranded version. However the style of construction matches closely the Tungsram 6K8GT.
The valve has a common cathode and the triode and hexode control grids are internally connected. The triode is build on one side of the cathode and the hexode is constructed on the other side. The triode local oscillator would produce 7.5 Volts peak to peak.
The input signal would be coupled to the frequency changer via the top cap connection to grid 3.
The cylindrical screen is topped with a screening plate.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 74 mm tall.
References: Datasheet & 1040. Type 6K8GT was first introduced in 1938.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2,g4
g1(t),g1
a(t)
h
k
g3

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-3
2.5
6
0.6M
0.36

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
3.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 18, 2017.
shape:wide.glass.tube construction:pinch type:triode.hexode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2.g4 pin:5.g1(t).g1 pin:6.a(t) pin:7.h pin:8.k pin:tc.g3
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