TM 11-2148 Telephone Repeater AN/TCC-11 Technical Manual Sept 1953 Army Air Force DTG but the chevrons

but the chevrons

or a starter rifle

Untested (typical for vintage tube sales unless specifically bench tested)

Pennsylvania State Police 75th Anniversary Edition

Two of them are Wilkinson marked

TM 11-2148 Telephone Repeater AN/TCC-11 Technical Manual Sept 1953 Army Air Force DTG but the chevronsOriginal Department of the Army Technical Manual TM 11 2148 covering the Telephone Repeater AN TCC 11. Published jointly by the Departments of the Army and the Air Force in September 1953, this manual provides complete technical information for installation, operation, maintenance, troubleshooting, and repair of this military communications system. An excellent reference manual for collectors of Signal Corps, Cold War communications, military