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PM2HL

Sensibly equivalent to:
210HL CV1050 HL2K VT50
See also:
The Philips-Mullard (PM) Series
    
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This PM2HL looks to be a replacement type. It was found in its original box and was priced at 4/9 (four shillings and nine pence). This battery triode is a small signal amplifier of low impedance and gain.
Flat on to the bright anode the grid, and notched support rods, can be seen to extend beyond the 22 x 12 x 5 mm anode. Note the coil springs above the top mica to tension the hot filament.
The anode in close-up shows the spacial relationship between the twin inverted V (coated?) filament and the grid. The wide spacing makes for a low mutual conductance.
The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 83 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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