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ID = 33361
United States of America (USA)
Brand: General Electric Co. (GE); Bridgeport CT, Syracuse NY
Tube type:  CW-magnetron 
Identical to ZM-6222

Filament Vf 2.5 Volts / If 2 Ampere
Description Low-power voltage-tunable CW magnetron (VTM). 2000 to 4000MHz, 1W minimum out, 2.3MHz/V tuning sensitivity.
Magnetic and RFI shieldings included.
The VTM, Voltage Tuned Magnetron, covers a wide frequency range. Its operation is quite different from that of resonant cavity types, where bunching is easily accomplished due to the high Q of the cavities. To have electron bunching, the VTM must operate with an electron current lower than the space-charge limited one: this is accomplished using a cold cathode in addition to an injection system with a filamentary cathode. Please, refer to the given application note.

Theory of operation. 
Weight 670 g / 23.63 oz
Information source - - Manufacturers Literature   

ZM-6222: Manufacturer's Literature
Emilio Ciardiello

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