Unusual magnetron, I also cannot find any information on this type number.  20 cm aka 1400 mc but relatively low power.  Perhaps this was an export tube to England during WW2?  The Brits were experimenting with L-band Airborne Intercept, the original AI.

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy

On Tuesday, May 6, 2025 at 12:11:49 PM CDT, Dave Merrill <r390a.urr@gmail.com> wrote:

Anyone have a clue what system this came out of? About 9" long. Marked 'US ARMY MADE IN U.S.A.' so WWII era.

Dave N9ZC 

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