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Pen220

Sensibly equivalent to:
220HPT 220OT KT2 PM22A PP2 PT2 PenB1
See also:
MAZDA Pen220 & Pen220A Advert - Mazda Pen220 & Pen220A Advert - MAZDA HL2 S215VM Pen220 Pen220A P220 & P220A Advert - Practical Class B Amplication
    
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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.
The filament is a pair of inverted V's. At the top of the envelope can be seen the helical springs used to tension the filament. The valve has three wire grids and an oval cylinder anode.
The balloon envelope is 43 mm in diameter and, excluding the B5 base pins, is 91 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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