The 1X2 (European: DY80) (P/N 154-0005-00) is a high-voltage rectifier tube with a B9A (Noval) miniature 9-pin base and an anode cap.
Its maximum inverse voltage is 15 kV and the maximum forward current is 1 mA. The filament operates on 1.25 V, 200 mA.
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Note1: A dot of yellow lacquer is applied to bottom of the selected tube.
A 1X2 tube in the RM565 HV Power Supply