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6K8G

Sensibly equivalent to:
CV1944
See also:
The 'Magic Three' Valves
    
Extras ▼

 

The 6K8G is the classic triode hexode frequency changer or mixer for broadcast applications. This exhibit has the War Department marking and the code ZA5307 on the base but 6K8G etched onto the glass. ZA5307 is the UK Army stores reference.
For isolation of the signal input and output circuits the hexode signal grid is taken to the top cap.
Unlike 6K8G from Brimar this exhibit has a perforated screen almost identical to the Tungsram 6K8G.
The outer screen and top mica. The heater, rectangular cathode and stout control grid supports are on the upper left side with the triode anode further up. The hexode section has its anode on the lower right. The grids, except the first, are parallel to one another and not wound round the cathode. See 6K8 for a diagram.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 100 mm tall.
References: Data-sheet & 1040. Type 6K8G was first introduced in 1938. See also 1938 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
nc
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 January 05, 2022.
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