[ARC5] SCR-274-N Version "-E" Components

[Jay Coward]

Mike,
 Were there any SCR-274N receivers, transmitters, modulators, antenna relays that had decals instead of nomenclature plates? I've seen many racks and shock mounts and dynamotors with decals and a damaged decal can easily change a "B" to an "E" or  even "F".
  Training schools often used obsolete gear for the trainees to refurbish to acceptable working condition. This may be where a typo could change the true record if the equipment was returned to government inventory.
 But I have not heard why the RCAF receivers were designated "-B". Were all "-B" receivers built/rebuilt with molded caps? Or, does a refit/rebuild not change the revision letter as long as "form, fit, or function does not change? So far, only audio output impedance change capability drives the "-B' rev change.
 Where I work there is a constant "growse" about how much change in a released product requires a CCN (configuration control number) change.
 Should the US and RCAF units be treated differently?
 Your mastery of this subject matter is most commendable. I hope you plan a book.
 Regards,
                Jay KE6PPF





 
-----Original Message-----
From: Mike Morrow <kk5f at earthlink.net>
To: arc5 <arc5 at mailman.qth.net>
Sent: Mon, Aug 15, 2016 4:45 pm
Subject: [ARC5] SCR-274-N Version "-E" Components

> There was a BC-454-E shown on eBay last week.
> I have two BC-456-E modulators.

I have seen these version "-E" components...I have a couple.

I am not aware *any* difference between them and the "-B" versions.  I've seen mention of only the "BC-456-E" in official documentation (12R2-3SCR274-1 Operating Instructions, 25 JUL 56, IIRC) in a passing reference without any significance or explanation, crudely typed in.

I believe the "-E" marking is specious...most likely an error of some sort where a "-B" should have been.  The -E models are identical to the -B models, from what I know.  But I'd love to find out something different.

Mike / KK5F
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