The AN/APR-4 was called "Old Faithful" by generations of countermeasures operators, and not without reason.

AN/APR-4 with TN-16/APR-4 Tuning Unit

Front Panel Controls

AT-49 cone used for 290-3,000 MHz, and SA-23 used to select various antennas, depending on tuning unit installed.

Another view of the AT-49 cone, along with two different styles of plastic covers to protect it in the aircraft slipstream.

F-19/UPR filter, used to provide the TN-17 with an extra stage of preselection to reduce images.

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