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HL2

Sensibly equivalent to:
210HF CV1673 HLB1 PM2HL
See also:
Osram S24, VS24, HL2, L21 & B21 Advert - Osram HL2 Advert
    
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The HL2 is a dull emitter battery triode. It was designed as a detector in broadcast receivers, in the early 1931 and re-issued as the HL2K in 1934 - same rating but different construction.
We know from the envelope that this was made in England.
The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 82 mm tall.
References: Datasheet, 1040 & 1043 Type HL2 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
150
-3
1.8
18,000
1.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 21, 2014.
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