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MSPenB

 
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Some Important British Valves
    
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The MSPen (1933) had the anode connected to the top cap. In the 'B' variant of 1937, the same device had the control grid connected to the top cap. The signal isolation afforded by taking the control grid to the top cap became standard practice for most manufacturers.
The amplifier pentode would have been used in RF and IF stages of domestic radio receivers.
The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 107 mm tall.
References: Datasheet & 1043. Type MSPenB was first introduced in 1937.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.0
200
100
-1.5
4.8
1.3
0.8M
2.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December14, 2012.
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