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327A UHF triode. Markings on the valve are:

U.S.Navy
Type #CWL-327A
Serial #D27744P HRS.50
Contract #NXs 6751

It measures 175mm by 110mm across the pins.

Made by Eitel-McCullough (later Eimac), the 327-A was a pulse triode used in SC-2 radar in a ring of four.

327A
327A inside view
Thanks to Jan Heering and Hans-Thomas Schmidt for information about this valve.

This file was last modified 14:47:44, Tuesday September 02, 2014