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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 PM12 PM1HL & PM2A Advert
    
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The PM1HL is an amplifier triode with external gold metalising paint 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. It was intended to be used in domestic broadcast receivers.
The balloon envelope is 40 mm in diameter, and excluding the B4 base pins, is 80 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 April 22, 2014.
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