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PM2

Sensibly equivalent to:
220P CV1019 NR28 P215 VR19
See also:
Mullard PM2 Box - The Truth About the Pentode - The Philips-Mullard (PM) Series - Valves
    
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The PM2 is an audio output triode made with the Azide process to produce an oxide coated filament for the good emission at low temperatures. The filament is for accumulator use and the anode is designed for dry battery operation.
In 1929 a revised PM2 was issued. The output power was 150 mW and the operating parameters are shown in the lower box.
The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 86 mm tall.
Reference: 1043. Type PM2 was first introduced in 1926. See also 1926 adverts.

 

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
0.15
100
-10.5
4
8,750
0.62

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.2
135
-10.5
6
4,400
1.7
Updated March 22, 2022.
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