[ARC5] interesting

[Robert Eleazer]

The original APR-4 came out in WWII and used octal tube technology for the base IF unit.  The APR-4Y was the Korean War version and used miniature tubes; the schematic I have is dated 1950.  The APR-4 would run on 60 cycle as well as 400 HZ but the APR-4Y was 400 HZ only.

I have an APR-4Y in which someone removed the power supply entirely.  One day when I'm not tied up fixing hurricane damage I might even get around to building a power supply for it.

Wayne
WB5WSV 

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