Sensibly equivalent¶ to:
This exhibit is labelled as a barium tube, clearly indicating an oxide cathode. The envelope also gives the heater voltage as 2.0 V and the anode voltage as 200 V. This valve is given as originally manufactured in 1929. The electrodes are pointed at an angle to the horizontal and the filament is a single 'V'.
The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 86 mm tall.
Reference: 1043. Type H210 was first introduced in 1929.
Absolute Maximum Operating Conditions¶
Updated April 26, 2013. shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f