R54/APR-4 WW2 RADIO RADAR RECEIVER 10 TUBES/VALVES 1945 

I still have the three? "plug in" front ends from one of these, I forget, 30mhz IF? output, or maybe 15mhz or so. Been at least 20 years since I played with them. "Back in" the day I managed to use the working receiver to help track down some paging interference going on with the STL up to the KREM2 TV transmitter in Spokane. When I called the engineer, they sounded incredulous, LOL. Gave them the call letters of the offending paging transmitter, and by that afternoon, it was GONE

I still have an APR-4Y stored with my "ham stash", it was purchased in the 1960s as my first tunable vhf radio, adding a preselector and a 30Mhz spectrum analyzer turned it into a great tool for discovering activity. thanks for sharing this video.

Audio was removed due to RU-vid.I was advised copyright etc etc I mean radio static and a few seconds of music! So I had to add an audio dub I picked up a few stations and she works good

39-4000mhz using 4 plugin units

No audio sample? wtf