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PM1HL

Sensibly equivalent to:
210HL CV3641 HL210 HL2
See also:
The Philips-Mullard (PM) Series - 2 Volt Valves for Battery Receivers - 1931 Advert - Mullard PM1HL Box
    
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The PM1HL is a 2 Volt amplifier triode.
The PM1HL was designed as a detector and general purpose valve and dates from 1931. It was intended to be used in domestic broadcast receivers.
The identification is etched into the dome of the envelope.
The horizontal bright anode with ribs to confer mechanical stability onto the thin nickel sheet.
The balloon envelope is 41 mm in diameter, and excluding the B4 base pins, is 75 mm tall.
References: 1931 datasheet & 1043. Type PM1HL was first introduced in 1931.

 

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 May 20, 2019.
shape:balloon construction:pinch type:triode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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