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ID = 28988
United States of America (USA)
Brand: Moorhead Laboratories (Pacific); San Francisco
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  <1925 very rare. ***
Identical to A-P_Rectifier
First year May.1921 Saga of the Vacuum Tube, Tyne page 176, 177

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Direct

This tube is based on the de Forest rectifier and has a Shaw base with the grid pin not connected. It was first Announced in the May 1921 issue of radio News as a New rectifier tube for experimental continuous wave work. With the aid of a small transformer, it could step up mains voltages to 350. 500 or 750 volts, thus making a high voltage generator no longer necessary.

Text in other languages (may differ)
Information source Saga of the Vacuum Tube, Tyne   page 176, 177
A-P_Rectifier: Radio News June 1921
Rudolf Osterkamp

A-P_Rectifier: Fin Stewart
Fin Stewart


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