[ARC5] BC-375: "Once more unto the breach, dear friends!"

[Christopher Bowne]

191s and 375s look much cooler running with the tube section cover removed, especially in an otherwise dimly lit shack.  And you can make a hell of a jammer transmitter by going key down on CW a while simultaneously waving your hand close up to the MO211.  Or you can go on FM without a microphone simply by close talking the MO tube! 

I have been running a 191 for many years on 80 and 160 on both CW and AM using an original BD-77 12V to 1KV dynamotor.  Back on December, worked across the pond with it on 160 CW the night before the AWA’s 1BCG replica transmitter was put on the air from the CT Radio and Electronics Museum in Windsor CT.  I was part of the local team that supported the museum’s hosting of the event. The AWA President was there and told me he had received emails from the stations I had worked in the UK the night before, who apparently thought they had worked the 1BCG replica transmitter.  

I put it on 630 meters this past winter and it worked well there, making about 75 watts output, but with disappointingly little chirp.  Mike, WA1JAS up in Maine also runs one on 630 meters and I believe he has worked across the pond with it.  Both of our 191s have just enough chirp to make their signals stand out from the more modern rigs others are using.  

Put a KV on yours and it’ll probably make rated 75 watts output just fine.  But be careful handling those 211s!

73 de Chris AJ1G
Stonington CT

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Sent from my iPhone

> On Jul 16, 2022, at 13:09, David Stinson <arc5 at ix.netcom.com> wrote:
> 
> Yes, here I go again, "tilting at the windmill"
> of finding a non-destructive alternative to
> $1400 worth of tubes, in hopes that some
> other irrepressible soul will lift a BC-375
> off the basement floor, out of the dark and
> endless "I'll get around to it" void,
> and "breath into it's wires and meters
> the breath of life."
> 
> Found this "hanger queen-" dirty, tubeless
> and forlorn, saved it from the "after hamfest"
> scrap heap and brought it home for "parts."
> Most of the covers went to someone's
> project (don't remember which one).
> Electrically, it is complete, though rough.
> It will make a good "test bed" for
> experimentation without messing-about with
> my completed SCR-287 station.
> 
> First thing to do was to get it working
> "original."  Lots of lubing, De-Ox-it and
> elbow grease and it's working, making
> RF out on 3890 KC.
> With just 400V regulated For B+,
> it's making 9W of carrier, 15W Peak
> with audio.  Now it's ready
> to be "fiddled and twiddled."
> 
> Anyone here heard of the Svetlana SV572-160 triode?
> Becoming a tube of interest to the Audio cultists.
> They're a "572 without the plate cap" they say.
> Has anyone played with these at RF?
> If one shops-around, one can get a quad of them
> for a couple of hundred bucks.
> /https://frank.pocnet.net/sheets/164/s/SV572-160.pdf
> 
> Every couple of years I seem to "get the bug"
> to work on this project again, even though it's
> unlikely even one other person will adopt it.
> It reminds me of lines from my favourite Kipling
> poem, edited for a 21st-Century reader:
> 
>  "As it will be in the future,
>   so it was at the birth of Man.
> 
>   There are only four things certain
>   since social progress began:
> 
>   that a dog returns to his vomit,
>   that a pig returns to her mire,
> 
>   and a burnt fool's bandaged finger
>   goes wobbling back to the fire..."
> 
> Gonna go do some more "wobbling."
> 
> GL OM ES 73 DE Dave AB5S
> 
> -- 
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
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