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MP-Pen

Sensibly equivalent to:
7A2 A70B AC/Pen APP4A MKT4/5 Pen4VA
    
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The MP-Pen was made in both B5 and B7 base versions, and was manufactured from 1931 in B5 and 1934 in B7. This popular type of audio output valve had many equivalents.
The classic envelope is 52 mm in diameter and, excluding the B7 base pins, is 110 mm tall.
References: Datasheet & 1040. Type MP-Pen was first introduced in 1931.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
D
4.0
1.0
250
250
-16
30
6.0
3.5
3.5W
8%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December14, 2012.
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