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AC2/Pen

Sensibly equivalent to:
7A3 A70C CV2808 KT41 N41 PT4 Pen4UB PenA4 TL44
    
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The AC2/Pen design is a 1930's audio pentode power output valve. In the 1930s Mazda held the technological lead in indirectly heated audio power valves. The 1930 landmark AC/Pen was a first generation device, and a very successful one, but required considerable drive.
The AC2/Pen was the market leading second generation output pentode. The second generation valves had better gain and could be driven directly from the detector output if required.
The classic envelope is 41 mm in diameter and, excluding the B7 base pins, is 116 mm tall.
References: Datasheet & 1043. Type AC2/Pen was first introduced in 1933.

 

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
ra
gm
Pout
D
4.0
1.75
250
250
-5.3
32
6.0
50,000
8.0
3.5W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December14, 2012.
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