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HL2

Sensibly equivalent to:
210HF CV1673 HLB1 PM2HL
See also:
Marconi HL2 Box
    
Extras ▼

 

The HL2 is a dull emitter battery triode. It was designed as a detector in broadcast receivers. In 1934 it was redesigned in a smaller envelope and called the HL2K. The box gives the Type as the HL2M with the M blocked out. The exhibit itself has clear glass with no visible markings.
The front to back dimension is a maximum of 5 mm.
The valve has two top mica sheets, the upper one carries the filament tension spring.
A closer view of the ribbed anode and within the oxide coated filament and the close wound wire control grid.
The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 85 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 July 21, 2017.
shape:balloon construction:pinch type:triode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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