WWII U.S. Military TN-18/APR-4 Tuning Unit – 300–1000 MC Radar/Radio Receiver Component

Original WWII-era U.S. military Tuning Unit TN-18/APR-4 covering the 300 to 1000 MC frequency range. This unit was part of the AN/APR-4 radar/radio search receiver system, used for high-frequency signal detection, electronic surveillance, radar warning, and related wartime/early postwar electronic work.

The front panel retains its original data plate marked Tuning Unit TN-18/APR-4, Range 300 to 1000 MC, with frequency dial, autosweep/manual control, speed control, dial light control, tuning knob, and side handle. The rear/interior photos show the aluminum chassis, tuning assemblies, coils, contacts, and mechanical sweep components. The unit is being sold as an original vintage military electronic component for collection, display, restoration, or parts.

Condition shows age, paint wear, scratches, oxidation, surface rust on internal components, and storage wear. Untested and sold as-is. A desirable APR-4 accessory, especially for collectors of WWII radar, radio countermeasure, aircraft electronics, and signal intelligence equipment.