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VR106

Sensibly equivalent to:
12VPA 9D2 ARP3 CV1106 CV1321
    
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The VR106 is a variable μ RF pentode supplied to the RAF before the CV system was introduced. The CV number for the VR106 is CV1106 and the commercial equivalent is the 9D2.
The 200 mA heater requirement indicates that this valve is suitable for series heater chain use.
The Air Ministry logo.
Looking up from the base. The multiple heater strands are in the centre.
The anode surrounds the whole valve and is of mesh construction. It looks as if it should be the electrostatic screen but inside one can see the three wire grids when looking up from the base.
Another example. The stores code is visible after the AM and on the bulb is etched a number 9.
The classic envelope is 38 mm in diameter, and excluding the B7 base pins is 96 mm tall.
References: Datasheet & 1043. Type VR106 was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
-
a
g3
h
h
k
g2
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
μ
13
0.2
250
125
-1
10.0
3.5
0.6M
1.65
1,000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 14, 2013.
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