[ARC5] RDO, and APR-1/SPR-1, TN-1B

[Robert Eleazer]

There were at least two versions of the APR-4.  The first version was the WWII model, which uses octal tubes.  The Korean War version was the APR-4Y, which uses miniature tubes; I have an example.

After WWII some of the individual tuning units were replaced with the CV-253/ALR converter, which plugged into the APR-4Y to cover 38-1000 MHZ.  The CV-253 moved the antenna connections, 4 of them, one for each band, to the tuning unit.   My APR-4Y came with the CV-253 plugged in.

I presume the older individual tuning units will still work in the APR-4Y, and I have one of those, too, covering 80-300 MHZ.

Together the two units became the AN/ALR-5.  I have a manual on the set should anyone need info.

Wayne