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PM4DX

Sensibly equivalent to:
410LF CV1151 CV1152 L410 NR15A NR16A
See also:
The Philips-Mullard (PM) Series - Mullard PM4DX Box - CV1151 short entry - CV1152 short entry
    
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The PM4DX is a triode and this exhibit carries a paper band on the Bakelite base and has details etched into the envelope. These start with the Mullard name, then the PM4DX as well as aerial, coil and earth logo.
The type designation was also etched in large letters on another part of the envelope as well as the BVA logo.
Valves in the 1920s tended to be packed in magnificent boxes with inner compartments to further protect the delicate contents. As home construction was very popular the basic operating characteristics appear on the box. This was clearly a valve box made to attract the consumer.
The balloon envelope is 42 mm in diameter, and excluding the B4 base pins, is 90 mm tall.
References: 1931 datasheet & 1043. Type PM4DX 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
4.0
0.1
150
-4.5
3.5
7,500
2.0
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated April 04, 2015.
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