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HL2

Sensibly equivalent to:
210HF CV1673 HLB1 PM2HL
    
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This HL2 is clearly labelled as to type on the base. The base also carries the impedance of 16,000Ω the μ of 24 and the mutual conductance of what is 1.5 or 1.3 it is not clear. What it does not have is a makers name.
The base style matches that used by Brivaron and 362 Radio Company.
The Text imprinted into the base.
The base: the impedance rating is the only clear lettering.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 97 mm tall.
References: Inspection, datasheet & 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
μ
2.0
0.11
150
-4
4.0
16,000
1.5
24
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 14, 2013.
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