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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 - Mullard PM12A, PM1HL & PM22 Advert - Mullard PM12A, PM1HL & PM22 Advert - Mullard PM12, PM1HL & PM2A Advert - Mullard 2 Volt Valves Advert - Mullard PM1HL Advert - Mullard PM1HL Advert - Mullard PM1HL Advert
    
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The PM1HL is an amplifier triode and it has external bronze metallising and a 2.0 Volt filament.
The electrodes are obscured by the coating on the envelope. 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 top of the envelope carries the identification, plus filament rating and maximum anode potential.
The balloon envelope is 39 mm in diameter, and excluding the B4 base pins, is 77 mm tall.
References: 1931 data-sheet & 1043. Type PM1HL was first introduced in 1931. See also 1931 adverts.

 

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 June 08, 2022.
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