Western Electric JAN 725A Pulsed Magnetron
Magnétron en régime pulsé
A waveguide-output, external magnet magnetron, fixed-tuned at 9375 MHz. Output was 55 kW.
Was interchangeable with 2J21. Used in Philco AN/APS-15 bombing bradar, APS-6, etc. Same as 4J50 except it had
smaller magnets to reduce size. Manufactured by WE and Northern Electric. Raytheon made a 725A but redesigned
the resonator system to use a vane-type structure which was more adapted to their manufacturing practice.
The 725A became one of the most extensively manufactured tubes, numbering over 300,000
among these three plants. This design led to the matrix cathode, as opposed to the sprayed-oxide cathode.
In the first version, the finely divided nickel and Ba-Sr carbonates were mixed and applied and then held
in place by a nickel mesh. The final version consisted of a coarse nickel powder and carbonates. The mixture
was sintered onto the surface of a machined nickel cathode. This extended tube life from tens of hours to
Fiche technique • Data sheet • Datenblatt:
83 x 140 x 153 mm • 3" 1/4 x 5" 1/2 x 6"
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