[ARC5] Audio transformers.

[WA5CAB at cs.com]

Ken,

According to AN 16-30ARC5-2, Parts List section, revised 1950 or 1954, all 
of the AN/ARC-5 receivers from R-23/ARC-5 through R-148/ARC-5X, T1 is A.R.C 
5631.  NAVAER 08-5Q-4 says ARA uses 5631.  I didn't look up RAT/RAT-1 or RAV 
as you're unlikely to have a scrapped one but would bet they are the same.

T.O. 08-10-50 only lists WECO part numbers and SIG STK Numbers.  -A 
SCR-274-N receivers use a transformer with the same number of terminals as the 5631 
(5) but it should have some other numbers on it.  -B receivers use a 
transformer with 6 terminals.  

So if it doesn't have 5 or 6 terminals, it isn't out of a receiver.  If it 
does and if it doesn't say "5631", it must be out of a Signal Corps receiver 
or possibly out of something else entirely.  The primary and secondary 
winding resistances are given in the manuals.

Robert D.

In a message dated 5/29/2013 11:07:41 AM Central Daylight Time, 
kgordon2006 at frontier.com writes: 
> OK. I am confused. I am trying to replace the audio transformers in a 
> couple of the receivers 
> I am working to resurrect here, and am not sure which audio transformer 
> goes where.
> 
> I have a transformer numbered 5631, which is in what I ***think*** is (or 
> was) an R-23/ARC-5 
> which is so badly hacked that it will take an unusual amount of work to 
> resurrect it. (It was 
> modified to tune ONLY to a VLF station on 22.3 KHz)
> 
> Would that be the appropriate/correct transformer to replace one missing 
> from a CBY-46104 
> receiver?
> 
> What about an R-25/ARC-5? Which is the correct transformer for that one?
> 
> Does anyone have any audio transformers they would part with for a 
> reasonable sum?
> 
> I absolutely cannot figure out why anyone would rip the original audio 
> transformer out of 
> these things!
> 
> It looks like the SCR-274N receivers all used one of only 2 different 
> transformers lettered ES-
> ******
> 
> I cannot find the necessary info in the only copies I have of the SCR-274N 
> units and the 
> AN/ARC-5 units.
> 
> Ken W7EKB

Robert & Susan Downs - Houston
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