Sensibly equivalent¶ to:
The Tungsram HR210 is a battery triode and is equivalent to the Mullard PM1HL etc. These very popular valves were used as detectors.
Our other HR210 is encapsulated within a classic envelope and coated with a gold coloured external Zinc metallic paint.
The base and split pins.
The balloon envelope is 42 mm in diameter, and excluding the B4 base pins is 82 mm tall.
References: Datasheet & 1043. Type HR210 was first introduced in 1933.
Absolute Maximum Operating Conditions¶
PDF scanned from an original document held by the museum
Updated February 09, 2013. 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