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ID = 55402
United States of America (USA)
Brand: Burroughs Corporation; Plainfield (NJ)
Tube type:  Beam Switching Tube - incl. "Trochotron"   Text 
Identical to BD-401 = 6702
First Source (s)
15.Oct.1963 : - - Manufacturers Literature

Base SPECIAL TUBEBASE in general
Was used by Military and/or Government
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect

Beam switching tube designed to operate as wide-band noise generator. The tube retains only two spade/target systems, other pairs being replaced by anode elements. Anode supply voltage is set for cut-off operation, while biasing of spades and targets is set to prevent stable states.
Target voltage 200V through 5K load resistor, target current 22 to 33mA; anode voltage 200V at 7mA, spade voltage -100V
Min 80mW noise output from 200 to 400MHz.
BD-401 were used in some lines of Hallicrafters AM/FM jammers, QRC/ALT-14,15,16.
Data kindly supplied by Lud Sibley.
"Operating principle of trochotron."
Look at the 6702 for data.

Information source - - Manufacturers Literature   
-- Collector info (Sammler)   TCA member Don Helgeson
Emilio Ciardiello
BD-401: Private collection
Emilio Ciardiello

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BD-401: Manufacturer's Literature
Emilio Ciardiello

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