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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. For isolation of the input and output circuits the signal is taken in via the top cap.
The connections under the lower mica. In the foreground is the triode anode. The cathode is common to both sections as is the triode grid. What looks to be a second heater at the rear is, in fact, a reflection.
See 6K8 for a diagram of the construction.
A close-up: the screen plates connected to the main round screen can be seen either side and behind the triode anode in the foreground.
Tilted for a better view.
The top mica. In complex valves such as this the mica supports are essential to define the electrode geometry.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 103 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 January 05, 2014.
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