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HL210

Sensibly equivalent to:
AR4 CV1303 CV3500 PM1HF
    
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The HL210 is without markings on the envelope or base. The pinch has HL210 written on it. The HL210 was made by Mazda and M-OV The spiral base pins on this exhibit match those used by Lissen.
An unusual Bakelite base and unusual spiral split pins.
The close-up shows two sets of support rods. The inner pair hold the filament ends. The base of the single V is held below the anode box.
The balloon envelope is 42 mm in diameter and, excluding the B4 base pins, is 94 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 December03, 2012.
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