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PM2A

Sensibly equivalent to:
220PA CV3643 LP2 P220
See also:
1931 Advert - Mullard PM2A Box - Mullard PM12 PM1HL & PM2A Advert
    
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The PM2A is a low power battery audio output valve and the output power is quoted as between 0.15 to 0.27 Watts. The load resistance required was 8,000 Ohms. This equates to high impedance headphones or a high impedance horn loudspeaker. The filament would be run from a 2.0 Volt accumulator.
The basic details of the valve are etched into the dome of the envelope.
The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 85 mm tall.
References: 1931 datasheet & 1043. Type PM2A was first introduced in 1930.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
Pout
2.0
0.2
135
-6
5.0
6000
3.5
0.27
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated April 22, 2014.
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