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PM2HL

Sensibly equivalent to:
210HL CV1050 HL2K K30K VT50
See also:
The Philips-Mullard (PM) Series
    
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The PM2HL battery triode was designed as a small signal amplifier. The valve is of medium impedance.
This example has a clear envelope thus revealing the electrodes.
The box anode has a W shaped filament allowing for four emitting surfaces. Filament tension is maintained by coil springs attached to the top mica. The fact that the envelope is clear and a top mica is used indicates a late production with an spray coated oxide filament rather than the earlier Azide process filament.
The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 86 mm tall.
References: Datasheet & 1043. Type PM2HL was first introduced in 1938.

 

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
0.1
135
-1.5
2.2
21,500
1.4
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated January 08, 2013.
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