[Milsurplus] AN/APR-4Y

[WA5CAB at cs.com]

Ray,

Other questions have been answered.  The 400 CPS rectifier power supply in 
the R-444/APR-4Y outputs 6.3 VAC, 150 VDC (regulated) and 185 VDC 
(unregulated) to the receiver.  The unregulated 300 VDC of the low current regulated 
supply (before the dropping resistor) is also run out to P-101C for the 
CV-253/ALR (or any of the other tuning units).

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 5/29/2013 3:55:34 PM Central Daylight Time, 
RAFANTINI at salisbury.edu writes: 
> Have been wasting tons of time on primitive counter measure receivers 
> that I bought at Dayton, mainly an AN/APR-4Y Have known that the APR-1, 4 and 
> RDO were all sort of dogs being all octal base tubes and not supporting FM 
> but somehow always held out hope for the APR-4Y being that it was a later 
> design and used seven pin tubes (6AK5, 6AL5) and the like that maybe 
> provided somewhat better performance. The thing is I am finding out that there is 
> almost nothing out there on these radios, wanted to know if anyone had any 
> information on them or something like a manual. Both the APR-4 and the Y 
> have the schematic located under the cover of the IF deck and I did 
> photograph and clean up a picture of the schematic for the APR-4Y if anyone wants 
> one but a couple things I have been looking for are (1) what is the B+ 
> voltage that was provided to the tuning heads? Think it may be +300 but not 
> cetin. (2) What was the rated sensitivity for the APR-4 in AM narrow and wide? 
> And what was it fo
> r the 4Y in AM narrow, wide and FM? (3) Is the CV253/ALR multiband head 
> the only correct head for the 4Y being that I don't have it have been working 
> with a TN-17 head from a regular APR-4, and last but not least I now 
> realize that the APA-10 Panadaptor appears to be a correct display for that 
> receiver. Saw two at Dayton including one in good condition but did not buy it 
> and am now regretting it.
> Ray F
> _____