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PM12M

Sensibly equivalent to:
218VSG 220VS CV1041 S215VM VR41 VS24 VS2 W21/4 W21
See also:
The Philips-Mullard (PM) Series - 2 Volt Valves for Battery Receivers
    
Extras ▼

 

The PM12M is a screened pentode for RF amplification. It is one of the early valves made with the anode as top cap connection, later types placed the control grid connection to the top cap for even greater separation of input and output circuits.
The PM12V variable μ pentode was released in 1932, and was replaced by the PM12M in 1933. We also have a version of the PM12M with a clear envelope.
PM stands for Philips Mullard, the names of the companies.
The metalised classic envelope is 43 mm in diameter and, excluding the B4 base pins, is 110 mm tall.
References: Datasheet & 1040. Type PM12M was first introduced in 1933.

 

Pin Connections
B4
1
2
3
4
tc
g2
g1
f
f
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
2.0
0.18
150
90
0
2.5
0.5
1.4
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated December19, 2013.
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