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VR124

Sensibly equivalent to:
ARP23 CV1124 MS/Pen NR70
See also:
CV1124 short entry
    
Extras ▼

 

The VR124 is the designation of an RAF receiving valve. The introduction of the Common Valve designations in 1941 renamed it the CV1124. Electrically the MS/Pen (or MSP4) are the closest commercial types. These were originally on a B5 base as well as the B7, MS/Pen was released in 1933.
The envelope shape matches the Cossor MVSPen and differers from other makers designs.
The RAF up arrow is the only marking on the reverse. Note the drain wire connecting the zinc paint coating to the base.
The classic envelope is 45 mm in diameter and, excluding the B7 base pins, is 107 mm tall.
Reference: Data-sheet.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
ra
gm
4.0
1.0
250
125
0.8M
2.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 21, 2020.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.- pin:2.g1 pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.a
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