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Pen220

Sensibly equivalent to:
220HPT 220OT KT2 PM22A PP2 PT2 PenB1
See also:
MAZDA HL2 S215VM Pen220 Pen220A P220 & P220A Advert - Practical Class B Amplication - MAZDA Pen220 & Pen220A Advert - Mazda Pen220 & Pen220A Advert
    
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The Pen220 is of classic Mazda shape and design of the 1930s.
The Pen220 is a battery output pentode for use in the audio output stage of domestic receivers. The Pen220A had a higher anode current and produced 1.1 Watts of audio, again with 7% distortion.
A look at the electrodes shoes the wire grids and the filament wires. The latter form a series of vertical zig-zags and each turning point is supported by a spring.
The balloon envelope is 43 mm in diameter and, excluding the B5 base pins, is 96 mm tall.
References: 1040 & datasheet. Type Pen220 was first introduced in 1931.

 

Pin Connections
B5
1
2
3
4
5
a
g1
f(-)
f(+)
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
D
2.0
0.2
150
150
-4.9
9
1.6
2.2
0.6W
7%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 22, 2014.
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