WWII 1944 War Department TM 11-1209 Test Set I-157-A Precision 920P Tube Tester

Original WWII U.S. War Department Technical Manual TM 11-1209, dated 20 November 1944, covering the Test Set I-157-A (Tube and Set Tester, Precision Model 920P).

This is a wartime technical manual for the military I-157-A electronic tube and radio test set. The front cover and title page retain the prominent period “RESTRICTED” classification notice, adding interest as an original WWII communications/electronics document.

The manual covers the operation, maintenance, testing, and technical information associated with the I-157-A/Precision Model 920P tester. It would make an excellent addition to a WWII Signal Corps, military radio, vacuum-tube equipment, or technical-manual collection.

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