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8D2

Sensibly equivalent to:
13SPA C50B CV1108 SP13C VR108
    
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The 8D2 is an HF pentode to an RAF specification that placed a 6J7G onto a B7 base and changed the heater to a 200 mA series heater chain type. Originally the RAF Type was called the VR108 and then in 1941 the CV designation was given as CV1108.
The Brimar name and Made in England.
The screen obscures the main electrodes but at the base the multi-loop insulated heater can be seen. The heater passes through the cathode tube six times.
The classic envelope is 38 mm in diameter, and excluding the B7 base pins is 96 mm tall.
Reference: Datasheet. Type 8D2 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
13.0
0.2
250
125
-2.2
2.5
0.9
1.5M
1.25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 22, 2018.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:200ma pins:7 pin:1.- pin:2.a pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.g1
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