[ARC5] APR-4Y Modification

[Roy Morgan]

On Jan 12, 2014, at 12:07 PM, Andy Young <andy-young at supanet.com> wrote: 
> 
> 
> An AN/APR-4Y
> MOD TO C.S.E. LAB MEMO 58
> Does anybody know what this means?

Andy,

I have one APR-4 (possibly no the Y version) that has had heater resistors added alongside the filter caps underneath the chassis.  I can’t say if it has such a marking or not since I’m not with it right now.

I have also another APR-4Y that I did use many years ago.  It has a lamp cord coming out one of the phone jacks, and I remember running it on house current.  The Y version of the radios is supposed to have a transformer for 400 cycles (and maybe up to 1000 cycles) only, so it’s possible that the modification you have is to install a 60 cycle capable transformer.  I suggest you inspect the power transformer to see if any markings reveal this.

Roy

Roy Morgan
RoyMorgan at alum.mit.edu
K1LKY Since 1958 - Keep 'em Glowing!