[AMRadio] BC-610 down=up and burnt't finals

W5OMR/Geoff w5omr at satx.rr.com
Wed Oct 26 18:42:38 EDT 2005

John E. Coleman (ARS WA5BXO) wrote:

> <>Not disputing any of what you said Bob.
> I just remembered a funny situation where Otis, K5SWK, had some one 
> else at
> his rig controls. The rig was and is single 833 modulated by a pair 
> and this
> story was of many years ago. The person at the controls is now a 
> silent key
> but I still won't mention his name. The story goes that Otis was down the
> street buying cigarettes, beer or something, and this person was visiting
> from out of town. Not realizing the rig had had a arc over on the tuning
> capacitor, that is never experiencing anything of that size before, the
> operator continued to talk while the big pole pegs melted the plate of the
> 833 in the final. The 833 had a hole burnt through the plate the size of a
> half dollar after the circuit breaker on the house when pop. The funny 
> part
> of this story is that that tube was a very good tube and continued to work
> perfectly with out even a drop in grid current at full output. I ask Otis
> if the tube showed any color and he said that he could not see the other
> side but that on the side facing him there was no place for the tube 
> to show
> color. He did change the tube later because he said that it was just too
> weird to look at the grid and heater through the hole and not see the 
> normal
> little red glow that was supposed to be there on the plate.
> John, WA5BXO

Otis's rig, is the only rig I know, that could be operated with only 1 
of the pair of 833's in the modulator lit up, and no one could tell the 

His homebrew exciter was supposed to use a 4-65, but the only 4-65 he 
had got damaged, or something, so he hastily lashed up an adapter plate 
for a pair of 6146's.  Those are probably the same tubes that are in the 
exciter.  His homebrew speech-amp uses a pair of 6146's in Class B, to 
drive the push-pull 833's.  Everything in that station was homebrew.  
Oh, I don't mean he wound his own resistors, or blew glass to make tubes 
out of, but you know what I mean.. gather up a bunch of parts, assemble 
'em in such a way as to cooerce a butt-load of electrons out of the 
wall, into thin air, and have 'em reappear at the other end intact, 
again.  Ah, the magic of Radio and homebrewing!

I know you know all about the station there, John... but not everyone 
knows Otis' rig (or Otis, for that matter!) like you do.

Sure miss hearing that signal on the air.  Sure will be good to get him 
back on, soon.

73 = Best Regards,

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