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6K8G

Sensibly equivalent to:
CV1944
See also:
The 'Magic Three' Valves - Brimar 6K8G Advert
    
Extras ▼

 

The 6K8G is the classic triode hexode frequency changer or mixer for broadcast receivers. The exhibit has a clear glass bulb and would rely on external shielding where other mixers had external zinc paint sprayed on to provide screening. For isolation of the signal input and output circuits the hexode signal grid is taken to the top cap.
Etched into the glass near the base is the word Canada indication the Country of Origin.
A diagram of the construction can be found in 6K8.
The outer screen. The hexode anode is fixed to the lower mica and can be seen on the left of the image. The heater, cathode and inner grid can just be seen on the right.
The hexode electron flow is from right to left in this image and the triode anode is on the right. The bright plate in the centre is an internal screen.
The triode anode inside the screen. Outside the lower mica is the rectangular cathode etc.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 97 mm tall.
References: Datasheet & 1040. Type 6K8G was first introduced in 1938.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
-
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
-2.0
3.0
3.0
1.3M
0.65

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
3.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 09, 2019.
shape:classic construction:pinch type:triode.hexode age:1930.1940 base:io heater:6.3v pins:8 pin:1.- 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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