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1738
Phillips 1738 rectifier
A 7.5 A full wave mercury arc rectifier designed
for battery charger use. Max input 300V rms. Base
Goliath Edison Screw. The side terminal is for
the screen which is connected via a 10,000 ohm
resistor to the cathode. The heater draws 18A
at 1.9 volts.
Frank Philipse has this PDF Data Sheet.