Sensibly equivalent¶ to:
AR4 CV1303 CV3500 PM1HF
The Osram HL210 was first introduced in 1928 and is a general purpose triode.
The etching on the face of the envelope is easy to read but hard to photograph as it is quite feint.
The etching on the dome is feint but with enhancement can be seen as brown. To the naked eye the lettering appears as a uniform grey.
The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 76 mm tall.
References: Datasheet & 1043. Type HL210 was first introduced in 1929.
Absolute Maximum Operating Conditions¶
Updated June 09, 2012.