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VR108

Sensibly equivalent to:
8D2 CV1108
    
Extras ▼

 

The VR108 is an HF pentode to an RAF specification. The Type was later renamed the CV1108 when the CV system was introduced to standardise procurement across all branches of the UK Government.
The prototype for the VR108 specification was the commercial 8D2. The 8D2 is electrically identical to the 6J7G except for the 200 mA 13 Volt heater - designed for series heater chains.
In addition to the VR108 and the up arrow the base also carries the old stores code of 10E/11096.
The additional code STCC and 101.
The outer screen makes viewing the internal structure very difficult. The wire grids are just visible,
The classic envelope is 38 mm in diameter, and excluding the B7 base pins is 98 mm tall.
Reference: Datasheet. Type VR108 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 January 09, 2017.
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