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PM24B

 
See also:
The Philips-Mullard (PM) Series - 1931: The New Mains Valves - Valves for Your Set
    
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The PM24B is a directly heated output pentode capable of some 3.0 Watts output. The PM24B was introduced in 1930.
The type designation and other information is etched into the top of the envelope.
Seen through the dome of the envelope the horizontal electrode assembly can be seen.
The balloon envelope is 57 mm in diameter and, excluding the B5 base pins, is 105 mm tall.
References: 1931 datasheet & 1043. Type PM24B was first introduced in 1930.

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
4.0
01.0
400
300
-40
30.0
-
2.1
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated May 26, 2018.
shape:balloon construction:pinch type:pentode age:1930.1940 base:b5 heater:4.0v pins:5 pin:
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