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MS/Pen

Sensibly equivalent to:
8AI A50A AC/S1Pen ARP23 CV1124 CV1282 MSP4 NR70 SC/SG SP4 SPT4A VR124
    
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The MS/Pen is an indirectly heated straight HF pentode. See MVS/Pen for the vari-μ version. Both valves have the same distinctive Cossor envelope shape.
This valve is branded Chelmer Valve - a reseller established in 2002.
The classic envelope is 44 mm in diameter and, excluding the B5 base pins, is 113 mm tall.
Reference: Datasheet & 1043. Type MS/Pen was first introduced in 1933.

 

Pin Connections
B5
1
2
3
4
5
tc
g2
g1
h
h
k,g3
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
4.0
1.0
200
100
-1.5
4.7
1.3
3.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 26, 2019.
shape:classic construction:pinch type:pentode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.g2 pin:2.g1 pin:3.h pin:4.h pin:5.k.g3 pin:tc.a
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