[ARC5] Suggestions Needed

[WA5CAB at cs.com]

Joel,

There must be about a bzillion scrapped or butchered BC-453-B's and 
R-23/23A's lying around.  There were only three audio output transformers made by 
A.R.C.for the Command Sets.ARA and AN/ARC-5 receivers used one, A.R.C. # 
5631, which had a nominal secondary impedance of 500 ohms.  The second (A.R.C. 
6308) and third (WECo ES-691027) were used in the -A series and -B series of 
SCR-274-N receivers.  The one used in the -B series (4000 ohm secondary 
tapped at 250 ohms) will replace the one in the -A series (4000 ohm secondary) 
as it is the same transformer with a secondary tap added.

I realize that the secondary turns given in the various manuals don't seem 
to agree with the given impedances but that's what the Navy and Signal Corps 
claimed them to be.  All of the transformers have the same primary (4000 
turns of #40 AWG).

As many of these things as there are around, there is really no need nor 
excuse for using something from RadSahck or Mouser as a substitute.  It is 
highly unlikely that they have a reasonable substitute for the ones in the 
SCR-274-N's anyway.  These latter each have nominal 4000 ohm secondaries, with 
the second one tapped at 250 ohms.

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

In a message dated 02/19/2016 18:11:57 PM Central Standard Time, 
joelroberts001 at comcast.net writes: 
> Good evening guys, I need some help on finding substitutions. Ken 
> suggested asking the group. I need replacements for the Neon Voltage Limiters for 
> the AF Transformer, and also need subs for the transformers, not 
> necessarily  NOS. No Rad Shacks left so will need to hunt Mouser or All Electronics. 
> Whatever help you can give would be great.... Joel   KB0FPT
> 
> 
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