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PM3

Sensibly equivalent to:
CV1151 NR15
See also:
The Philips-Mullard (PM) Series - Mullard PM3 Box - Mullard PM3 Box - CV1151 short entry
    
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The PM3 was introduced in 1926 as a general purpose triode with a μ of 14. The filament current, initially 0.1 Amp was later reduced to 0.075 Amps and the label on this specimen specifies 0.075 A filament current. Our other PM3 is an earlier example and consumes 0.1 A filament current at 4.0 V.
The identification details are printed on the dome of the envelope. looking from the base up under the silvering on the glass reveals a horizontal box anode.
This is supported from the pinch by stout wires that form a wide U. The anode is stippled.
The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 87 mm tall.
References: 1931 datasheet & 1004 Type PM3 was first introduced in 1926.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
ra
gm
4.0
0.075
125
16,000
0.85
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated April 04, 2015.
shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:4.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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