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ID number:  BIRRC-P0905
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Mullard
Title / Object name:  Cavity magnetron – Mullard JP9-75 with magnet
Object type:  Cavity magnetron
Place made:  Great Britain
Materials:  Mainly copper and glass magnetron mounted in permanent magnet
Measurements:  14.5 x 9 x 15 cm. Anode block not more than 2.7 cm across and 2.7 cm high
BIRRC-P0905.jpg

A more modern cavity magnetron complete with heavy external permanent magnet. In the image the high voltage and cathode heating current enter down the lead at the top and the microwaves emerge through the window on the front which bolts straight onto a waveguide.

Inscriptions / Translations:  Mullard JP 9-75 Made in Great Britain. 3587

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