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HL210

Sensibly equivalent to:
AR4 CV1303 CV3500 PM1HF
    
Extras ▼

 

The HL210 is a general purpose battery triode with a two volt filament. This example is unusual in that the dome is deformed. Like HL210 The only markings on the valve are the Type designation HL210 near the base.
The deformed glass dome. At no point does the glass touch the inner electrodes and so it is not an exercise in supporting the valve against vibration.
The glass is clear for half the circumference and so the fine wire grid and oxide coated filament are easy to see.
A closer view.
The balloon envelope is 45 mm in diameter and, excluding the B4 base pins, is 87 mm tall.
References: Datasheet. Type HL210 was first introduced in 1929.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
ra
gm
2.0
0.1
150
28k
0.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 23, 2015.
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