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HL2

Sensibly equivalent to:
210HF CV1673 HLB1 PM2HL
    
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The HL2 is a dull emitter battery triode. It was designed as a detector in broadcast receivers, in the early 1930s. This exhibit is made by Lissen and the gettering obscures most of the construction.
The bright anode is just visible The previous owner has marked the envelope to show that at an anode current of 2 mA the gm is 1.7 mA/V.
The identification is etched into the envelope dome. The made in England is at the top and the Lissen logo beneath the HL2.
The pinch, lower mica grid and anode are just visible.
The balloon envelope is 42 mm in diameter and, excluding the B4 base pins, is 92 mm tall.
References: Datasheet & 1040 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 December26, 2011.
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