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PM2A

Sensibly equivalent to:
220PA CV3643 LP2 P220
See also:
The Philips-Mullard (PM) Series - 1931 Advert - Mullard PM2A Box - Mullard PM12 PM1HL & PM2A Advert
    
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The PM stands for Philips-Mullard and were introduced in 1925. The PM2A is a later addition to the original range from 1929. The series all had oxide coated filaments.
These audio valves could drive a small loudspeaker. The PM2A had an output rating of 0.15 Watt at 5% distortion.
The balloon envelope is 43 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
2.0
0.2
135
-6
5.0
6,000
2.0
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated April 22, 2014.
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