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[AMPS] ...why not use with the mains

To: <amps@contesting.com>
Subject: [AMPS] ...why not use with the mains
From: nospam4me@juno.com (nospam4me@juno.com)
Date: Fri, 19 May 2000 09:23:00 -0700

Hi Steve, 

Because you'd lose the isolation provided by the transformer.  

skipp

--------- Forwarded message ----------
From: ab2et@juno.com
To: amps@contesting.com
To: <amps@contesting.com>
Date: Fri, 19 May 2000 12:18:38 -0400
Subject: Re: [AMPS] conversion of 6.3 volt (6LQ6) tubes to 31 volt
version
Message-ID: <20000519.121840.-4179921.0.ab2et@juno.com>

If you Series up the four 31 volt heaters why not just use the "mains" 
or one leg  with a simple  1/2 wave rectifier ...
I have done this on a couple of  "low budget" conversions that have
worked out quite well.

And now I am off to Dayton.

73's
Steve
AB2ET

On Wed, 17 May 2000 22:27:49 -0700 nospam4me@juno.com writes:
> 
> Alek, 
> 
> The heater for the average sweep tube (6LQ6) consumes 
> about 16 watts of power.  Yes, you can run an out board 
> transformer, or an inboard additional transformer in a few 
> different types of circuits. 
> 
> 
> 1. You can remove the 6.3 volt paralleled leads from the tube 
> sockets.  Add a 24 volt ~2 amp transformer secondary in 
> series with the 6.3.  The primary wired parallel with the other 
> xmfrs primary, the proper leads connected "in phase" to the 
> 117 vac for an approx 31 vac secondary, just what you need.
> 
> 2. If an amplifier has 12.6 volt heaters, you can secondary 
> series another 18 volt transformer to obtain the ~31 volts. 
> 
> 3. Series up the four 31 volt heaters (`124 volts) and you'd be able 
> 
> to run a filament transformer in reverse off the original amp 
> windings.  Not realistic since you require a 12 amp xmfr for this 
> "trick".  
> 
> cheers
> skipp
> 
> ####
> From: Alek Petkovic <vk6apk@eon.net.au>
> ps: I ended up with 8 x 31LZ6's at $14.00 each so I think I got a 
> reasonable deal.
> They are supposed to be like the LQ6's.
> 
> 
> At 10:48 PM 16-05-00 -0700, you wrote:
> 
> 
> >Hi Alek,
> >Marv is right, my spec sheet for that tube (RCA Brand) states the 
> warmup
> >as 11 seconds min.  Typical
> >of sweep tubes.  Be sure to go over to my  http://sonic.ucdavis.edu
> >server and down load my Dentron
> >Cathode current cutoff mod for the Dentron.  Save your tubes.   
> There
> are
> >two Dentron Download available
> >on the site, one is a copy of an old Ham Radio Mag article, the 
> second
> is
> >my work up with the circuit
> >diagram.
> >cheers
> >skipp
> >
> > > On Mon, 01 May 2000 17:54:45 +0800 Alek Petkovic
> ><vk6apk@eon.net.au>writes:
> > >G'day from "Down Under.
> > >I've just ordered 2 sets of 4 x 31LQ6 tubes for my little Dentron
> >GLA-1000
> > >amp. These will replace the tired 6LQ6 tubes presently in the 
> unit.
> > >The tube swap will of course necessitate an extra transformer to 
> run
> the
> > >heaters of the new tubes.
> > >
> > >Does anybody on the reflector have an idea of the current drawn 
> by the
> > >heaters in these tubes?
> > >... so I figure on around 2A total for the four tubes in 
> parallel.
> > >I have a transformer rated at 100VA which I hope will do the job 
> with
> a
> > >generous safety margin.
> > >Am I correct in the above assumption?
> >
> >:Hi Alek,
> >:Yes, that's the way it works -- should be right around 500 mA per
> >:tube.  The 31's also have a "controlled" warm-up time which was a
> >:requirement for their original application in series filament 
> string
> >:style TV's.
> >:73, Marv  WC6W  310 649 3111
> >
> 
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________________________________________________________________
YOU'RE PAYING TOO MUCH FOR THE INTERNET!
Juno now offers FREE Internet Access!
Try it today - there's no risk!  For your FREE software, visit:
http://dl.www.juno.com/get/tagj.

--
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Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
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