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PM1HF

Sensibly equivalent to:
AR4 CV1303 HL210
    
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This battery triode was designed in 1926 for the HF stages in broadcast receivers. The filament would be run from a 2.0 Volt accumulator.
The electrodes lie horizontally in the balloon envelope.
The feint etched identification can just be seen.
The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 83 mm tall.
References: 1931 data-sheet & 1043. Type PM1HF was first introduced in 1926. See also 1926 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
100
0
2.3
22.5k
0.8
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated May 20, 2023.
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