[ARC5] BC-454-B listed in THAT place.

[WA5CAB at cs.com]

No. The "-B" models (or most of them) were made by Western Electric.  The 
first few thousand were still painted black wrinkle but the majority were 
unpainted.  The "-B" models also have the 250 ohm (Lo-Z) tap on the receiver 
audio output transformer and two of the transformers in the modulator.  Which 
isn't visible from the outside.  Note 3 on the transmitter system schematic 
in later T.O. 08-10-50 says 600 ohms but Signal Corps practice at the time 
was to call it 250.  Nameplates on the receivers and transmitters were also 
moved to the right side of the chassis on the unpainted ones.  Which made 
sense for several reasons.

In a message dated 08/15/2016 08:47:20 AM Central Daylight Time, 
arc5 at mailman.qth.net writes: 
> Doesn't a "-B" model imply a remanufactured unit? I had a BC-455-B once 
> that was remanufactured for the Royal Canadian Air Force  and all the 
> capacitors were replaced with modern molded ones.  That receiver picked up 
> McMurdo Station one winter night when I was living on Martha's Vineyard back in 
> the early '70's.
>   Jay
>  
> 

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