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PM2DX

Sensibly equivalent to:
210D 210Det CV3645 L2/B L210 L2
See also:
The Philips-Mullard (PM) Series - 2 Volt Valves for Battery Receivers - Mullard PM2DX Box - Experiments with Light Control
    
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The PM2DX was introduced in 1928 and is described by Mullard as being for detector and general purpose applications within battery broadcast receivers.
The envelope is smaller than the PM2 and the electrodes are obscured by the gettering over the top of the dome, but the pinch is clearly visible.
The identification lettering is on the top of the envelope in gold. Both the filament volts and the maximum anode voltage are printed.
The filament is for accumulator use and the anode is designed for dry battery operation with a maximum anode voltage of 150 Volts.
The PM2DX was also popular as a driver valve for quiescent push-pull output stages such as the PM2B.
The balloon envelope is 40 mm in diameter and excluding the B4 base pins, is 78 mm tall.
Reference: Datasheet. Type PM2DX was first introduced in 1928.

 

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
0.25
150
-6.0
2.5
10700
1.25
PDF scanned from an original document held by the museum
Updated April 23, 2014.
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