[Milsurplus] R-375/APR-4X

[WA5CAB at cs.com]

Jack,

The R-374/APR4X wasn't a prototype.  It was the second of three production 
models of AN/APR-4(*).  The X suffix, like the Y on R-444/APR-4Y, indicates 
it has different input power requirements or ratings.  I don't have a manual 
on the R-54/APR-4 to check but R-375 input is 115 or 80 VAC, 60 to 2600 
CPS.  R-444/APR-4Y input is 115 VAC 380 to 1000 CPS.  All three were produced 
in significant quantities.

AN 16-35R375-2 dtd 12/05/44 later became AN 16-30APR4-3 and 
administratively became T.O. 12P3-2APR4-2.  I have a reprint under the middle number 
revised through 05/07/54 for $21.00 plus $3.00 shipping.  I also am supposed to 
have an extra original but it's only revised through 04/12/46.


In a message dated 07/01/2013 14:03:57 PM Central Daylight Time, 
wa1tej at yahoo.com writes: 
> I picked this up this AM on eBay. Nothing on it via Google. Manual I need 
> is AN16-35R375-2 dated 1953. S/N is 185. I'm assuming this was a low 
> production prototype for the follow-on R-444/APR-4Y. Anyone have any info on 
> this?
> 
> Jack
> _

Robert & Susan Downs - Houston
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