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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. As a 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 classic envelope is 38 mm in diameter and, excluding the IO base pins, is 100 mm tall.
References: Private communication & datasheet.

 

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 January 02, 2013.
shape:classic construction:pinch type:pentode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2 pin:5.g3 pin:6.- pin:7.h pin:8.k pin:tc.g1
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