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VT74

Sensibly equivalent to:
6J7G ARP16 CV1074 KTZ63 NR83
    
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The VT74 amplifier pentode was designed as a low noise audio pre-amplifier. After the advent of the CV register the valve was renamed the CV1074.
As an RAF Valve Transmitting type it was probable that this would have been used as a microphone amplifier at the input to a telephony transmitter. The 6J7G is the closest commercial equivalent.
The Internal coating obscures the details of construction.
Looking down from the top the cathode is a cylinder and the control grid is wound on copper supports. There are two further grid supports either side confirming this as a pentode.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 102 mm tall.
References: Private communication & data-sheet.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2
g3
-
h
k
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-2
1.0
0.25
1.5M
1.23
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 12, 2021.
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