[R-390] Stewart Warner production numbers..?

Sun May 29 18:54:02 EDT 2022

Jim, my 390a is EAC FR-36-039-N-6-00189 (E) serial # 1858 with nothing under the tag, like one of your EAC’s. I don't see this contract in the contract list. Dan

Sent from my iPad Air4

> On May 28, 2022, at 12:10 PM, Jim Whartenby via R-390 <r-390 at mailman.qth.net> wrote:
> 
> LarryI have four R-390A receivers.  Two are EAC, one is a Capehart and the last is a Stewart-Warner.
> EAC, Nomenclature Tag S/N is 1165, Contract is FR-36-039-N-6-00189E
> EAC, Nomenclature Tag S/N is 1666, Contract is DAAB05-67-C-0155
> Capehart, Nomenclature Tag S/N is 2896, Contract is 21582-PC-61
> Stewart-Warner, Nomenclature Tag S/N is 185, Contract 20139-PC-60
> Looking beneath the Nomenclature Tags one can find, on occasion, an inspection stamp from the Government Source Inspector.  Usually Army, sometimes Navy.  Neither EAC had any markings under the tag but both the Capehart and Stewart-Warner had an inked stamped serial number.  
> They are 2922 for the Capehart and 2576 for the Stewart-Warner so this might be another place to look for production S/N's.
> A question for Nick: I also have four R-390 receivers.  All have seen better days and are not complete examples so the idea is to make one or two working units from the four organ donors.  Three have nomenclature tags supplied by Collins.  The fourth has no tag so I have no idea who was the manufacturer.  If Collins also had a S/N on the main frame, where would it be located?
> Regards and have a great Memorial Day,Jim
> 
> Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy
> 
> -----Original Message-----
> From: Jordan Arndt <Outposter30 at shaw.ca>
> To: Larry H <larry41gm at gmail.com>; Jacques Fortin <jacques.f at videotron.ca>
> Cc: R-390 Forum <r-390 at mailman.qth.net>
> Sent: Sat, May 28, 2022 11:11 am
> Subject: Re: [R-390] Stewart Warner production numbers..?
> 
> Hi group...
> 
> While I'd like to have a somewhat larger sample size, I'd like to thank Gary, Jacques, Larry, Tom et al for the info I have received.
> 
> From what I can discern thus far, my belief is that the 1959 and 1960 SW production was actually a single production run spread out over 2 contract numbers.
> 
> The reason I believe this to be the case is that the serial numbers of the modules and front panels do not work under any other scenario, unless it was common to have many hundreds or thousands of spare or excess modules and front panels produced, which makes no economic or manufacturing sense.
> 
> For example, the 1960 SW I've been slowly restoring has mainly 1960 production modules and front panels all of which are numbered well over 5,000, while the high known S.N. for that run is 4,572. Eg. the front panel is number 5266 and the remaining 1960 SW modules are all within a few hundred either way of that number.
> 
> What I believe is that the serial number on the ID tag is actually a serial number the final assembly of the various modules and chassis, and was likely re-set to zero sometime in early 1960, which makes a great deal of sense both for record keeping and production as I've experienced in ISO-900x manufacturing.
> 
> When I was involved in the production of optical mark reading equipment which were to be installed in lottery terminals, every CRT, power supply, ckt board and mechanical structure or device was assigned a particular serial number for record keeping for QA/QC and ISO tracing.
> 
> After passing QA/QC burn-in and testing, these assemblies and modules were later installed into the terminal unit and then the entire terminal unit assembly was then given a serial number and was tracked throughout its use along with the installed modules.
> 
> If one of the modules failed, it was returned for examination and repair where possible, and the modules list of the terminal unit was changed to show that a module(s) had been replaced and the listed serial number changed to that of the replaced module.
> 
> I believe that I can say with some certainty that no production engineer or manager would ever even attempt to have the various module/assembly serial numbers match on any production "unit" because that would be almost impssible to implement without slowing production to an absolute crawl. The logistics of that would be egregiously complex and very expensive to implement.
> 
> Obviously, I can't account for what happened in the field after delivery given Depot module replacement and/or swapping, but I'd expect some type of similar record keeping would have been in place. Does anyone have that type of information...?
> 
> Interestingly, the reason that I started looking into this is that I am trying to determine what an appropriate ID Tag for the 59 and 60 SWs I have might be...
> 
> I'll likely post a 2nd part of my spiel, but I would appreciate any comments or info which you folks might provide...!
> 
> 73 for now...Jordan VE6ZT
> 
> 
> ----- Original Message ----- 
>   From: Larry H 
>   To: Jacques Fortin 
>   Cc: Jordan Arndt ; R-390 Forum 
>   Sent: Friday, May 27, 2022 8:02 PM
>   Subject: Re: [R-390] Stewart Warner production numbers..?
> 
> 
>   Yes, the date on this file is 3-18-2022.
> 
> 
>   Regards, Larry
> 
> 
>   On Fri, May 27, 2022 at 1:03 PM Jacques Fortin <jacques.f at videotron.ca> wrote:
> 
>     I believe that the latest info available is here:
>     https://www.r-390a.net/R390a%20R390%20R391%20Production%20Notes.pdf
> 
>     73, Jacques, VE2JFE in Montreal
> 
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