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ID = 33332
United States of America (USA)
Brand: Bomac Laboratories Inc., Beverly, Mass.
Tube type:  TR-switch 
Identical to BL-397A

Filament No heater
Description X band TR and shutter tube, 9250 to 9500MHz, 250KW, w-guide flanged. 600V at 200uA ignitor, internal limiting resistor; 28VDC, 160mA max shutter.
White, ignitor; black and purple, shutter coil. 
Weight 170 g / 6.00 oz
Information source - - Manufacturers Literature   
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BL-397A: Private collection
Emilio Ciardiello

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