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VR99

Sensibly equivalent to:
CV1099 CV1193 NR82 X65 X66
    
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The VR99 is a triode hexode, and the VR denotes that it was designated for use with the RAF as a receiver device. The paper label over the etched M-OV identification declares it to belong to the Air Ministry.
The direct commercial equivalent is the X66 and when the CV register was built the VR99 became the CV1099. The X66 itself is a selected X65.
The triode was designed for local oscillator use and an injection voltage of 10 V peak to peak was produced. The hexode mixer took the signal into the top cap grid, thus maintaining the greatest separation between grid and anode circuits.
The etched lettering is feint but present is VR99 and in the circle is MWT for Marconi's Wireless Telegraphy.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 100 mm tall.
References: Datasheet & 1043. Type VR99 was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2,g4
g1(t),g3
a(t)
h
k
g1

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
ra
gm
6.3
0.3
250
100
-3
1.75
2.5M
0.225

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
4.75
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December07, 2019.
shape:classic construction:pinch type:triode.hexode age:1940.1950 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2.g4 pin:5.g1(t).g3 pin:6.a(t) pin:7.h pin:8.k pin:tc.g1
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