[ARC5] APR-4Y Modification

[Andy Young]

Ray,

Thanks for the suggestions. I'll have a look for the resistors, but I can 
say that the power transformer is clearly marked 115v at 380 to 1000 cycles 
and looks like it has always been there!

Andy


----- Original Message ----- 
From: "Roy Morgan" <k1lky at earthlink.net>
To: "Andy Young" <andy-young at supanet.com>
Cc: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Sunday, January 12, 2014 7:15 PM
Subject: Re: [ARC5] APR-4Y Modification



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!