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994V

 
See also:
The Azide Process
    
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The Mullard 994V is an indirectly heated triode designed for use as a detector or resistor/capacitor voltage amplifier.
For details of the series of indirectly heated triodes that ended with the 994V See 154V.
The outer metal loaded screening paint has become detached in places and the original etched identification can be seen on the dome. The nature of the Azide process obscures the inner structure.
With some imagination one can make out the mica sheet within that holds the vertical electrodes in place.
The balloon envelope is 45 mm in diameter, and excluding the B5 base pins is 100 mm tall.
Reference: 1043. Type 994V was first introduced in 1933.

 

Pin Connections
B5
1
2
3
4
5
a
g1
h
h
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
4.0
0.65
200
-1.5
1.35
33,000
3.6
Updated March 17, 2019.
shape:balloon construction:pinch type:triode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.a pin:2.g1 pin:3.h pin:4.h pin:5.k
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