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MVSPen

Sensibly equivalent to:
9A1 A50M AC/VP1 CV3571 HP4106C VMP4G VP4A VPT4B
    
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The MVS-Pen is a variable μ RF pentode designed for radio receivers. It is indirectly heated and features the then standard UK heater of 4.0 V at 1.0 A.
Initially in 1933 the MVS-Pen came with a B5 base cap. In the same year the B7 base version was released.
Thereverse is plain zinc paint.
The classic envelope is 45 mm in diameter, and excluding the B7 base pins is 105 mm tall.
References: Datasheet, 1040 & 1043. Type MVSPen was first introduced in 1933.

 

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
250
125
-1
5.1
1.2
0.625M
2.3
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated March 17, 2014.
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