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VT-167

Sensibly equivalent to:
6K8
See also:
Metal Striptease - The 'Magic Three' Valves
    
Extras ▼

 

The 6K8 triode hexode valve was purpose designed as a radio frequency changer and the American Government purchased it as the VT-167.
The valve has a common cathode and is an excellent design in that the triode and hexode control grids are internally connected in a way that saves space and still allows for a separate triode anode. See 6K8 for a structural diagram..
The local oscillator would produce 7.5 Volts peak to peak signal from the triode section. The input signal would be coupled to the frequency changer via the top cap connection to grid 3.
The RCA logo.
The thin metal tube envelope is 25 mm in diameter and excluding the IO base pins, is 63 mm tall.
References: Datasheet & 1040. Type VT-167 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 February 17, 2015.
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