Original NOS U.S. military Echo Box TS-270B/UP

Original NOS U.S. military Echo Box TS-270B/UP, manufactured by Amerac Incorporated, serial number 153, order number 4399-PP-60. Comes with its marked metal storage case, technical manual TM11-1086 for Echo Boxes TS-270/UP, TS-270A/UP, and TS-270B/UP, and the original packaged carrying strap.

This unit was used as radar test/calibration equipment for checking transmitter performance and frequency response. The assembly includes the main echo box unit, ring prediction/frequency adjustment dial, meter, cable/lead sections, mounting base, and original case marked “Case for Echo Box TS-270/UP.”

Condition is NOS/New Old Stock military surplus with light storage wear only, including minor paint wear, scratches, small spots of oxidation, and age/storage marks from long-term storage. Manual and accessory packet are included. Untested and sold as-is due to age, but appears unused.