[Milsurplus] [ARC5] BC-348 Reduced B+ Report

WA5CAB at cs.com WA5CAB at cs.com
Fri Sep 7 11:43:14 EDT 2012


Ian,

Judging from AN and T.O. dates, I think that it is incorrect to refer to 
the models using single ended tubes as the "newer" models.  They did not 
supercede the "older" models.  A more accurate characterization would be to call 
them the "cheaper" models.  Based on manual dates, the BC-348-J, K or L, and 
M all date from early to mid 1942.  And models in each of the three 
contractor groups were produced through the end of the War.

However, your comments on the voltage regulator are correct.  In 
BC-348-BCG, HKLR and EMOPS, running the B+ much below 200 VDC would result in the 
regulator being inoperative.

In a message dated 09/07/2012 08:53:53 AM Central Daylight Time, 
ianmwilson73 at gmail.com writes: 
> Dave,
> 
> Is this one of the older models (with double-ended tube types), or newer
> (with single-ended tubes)?
> The reason I ask is that with the -R (if I recall correctly), the neon
> stabilizer tube that goes with the
> HF oscillator won't strike if the B+ drops below about 170V.
> 
> 73, ian K3IMW

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


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