[ARC5] Heater wiring - 12V vs. 24v

[WA5CAB at cs.com]

Les,

I've never heard of any mention that A.R.C. ever made any AN/ARC-5 orders 
directly for Commonwealth Air Forces.  Which means that all components were 
made for USN and would (should anyway) have USN markings.  Regardless of 
where they eventually ended up.

Back to a comment you made earlier about the tubes in the R-24 you have.  I 
got the impression that you thought the presence of tubes with 12 volt 
heaters supported your argument that your receiver was originally built as a 14 
VDC unit.  Not so.  All of the RAT, RAT-1, RAV, ARA, SCR-274-N, AN/ARC-5 and 
AN/ARR-2 receivers used 12.6 volt tubes.  Whether they were built for 14 or 
28 VDC primary supplies.  

Anyway, if your R-24 is wired for 14 volts, it was modified by someone 
after it left the factory.  If it had been built by A.R.C. or Stromberg-Carlson 
as a 14 volt set, it would have had a different nomenclature than R-24.  And 
would have also been marked "/ARC-5X".  You can't base whether the set was 
wired that way at the factory on "the wiring looks factory".  If RCAF had 
some of them modified (and they probably did), they would probably have been 
smart enough to have the work done by a competent contractor.  What actually 
surprises me is your description of how crudely the nameplate modification 
was done.  

In a message dated 6/28/2010 11:14:19 PM Central Daylight Time, 
vk2bcu at operamail.com writes: 
> Hello Michael,
> In our exchange of e-mails, I'm unclear about the order but I'm certain 
> this set is US navy, because I see the anchor and "released on" in yellow 
> Navy paint adjacent to the 7 pin connector on the rear panel.  It's not RAAF, 
> unless the US navy gave these sets the the Australian RAAF with THAT 
> marking on it.
> 
> On a different subject, how do you justify the HUGE effort in collating 
> all the info for your book and the time to write it?
> 
> Les
> 

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