[NJARC] Hallicrafters SX-16 PS

[John Ruccolo]

Hi Scott,

All is not lost. Did you run the transformer without a
load (no tubes at all), just to see how it behaved, as
Jim Whartenby suggested? Or, just run it with *no*
rectifier tube for a while, but with all other tubes
in, and check the warmth of the transformer. The
rectifier tube meltdown appears to have stressed the
xformer, but it may still be OK.

I just checked the schematic -- I happened to run into
the SX-16 while looking for Grunow chassis 5V.

The headphones are on the 5K winding from the output
transformer. So, temporarily, pull just *one* 6V6 and
use an 80 for a rectifier.

On another note --

Bob Bennett -- My Rider's (Vol. 9) goes up to chassis
5Q, but no 5V. Hmmmm....

JR


--- Scott Roberts <ng19delta at yahoo.com> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> I do have an 80, I don't have any 5Z3s or 5U4s- got
> a couple
> 5V4s, but don't think they are quite the same... ;)
> 
> Guess this project is tabled for the moment- till I
> get another
> tube- or temporarily test the 80 idea...
> 
> Scott
> 
> --- John Ruccolo <jr6v6gt at yahoo.com> wrote:
> 
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > Hi Aaron,
> > 
> > Good point. But fortunately, 5Z3's are still
> fairly
> > easy to get. My suggestion of an 80 was strictly a
> > temporary thing, so Scott culd keep
> troubleshooting.
> > 
> > But you're right -- it wouldn't be hard to build
> an
> > adapter. Scott already has the 4-pin base. ;-)
> > 
> > 
> > JR
> > 
> > 
> > --- Aaron Hunter <ahunter01 at comcast.net> wrote:
> > 
> > > Visit our web site - See http://www.njarc.org
> > > _______________________________________________
> > > 
> > > Scott
> > > 
> > > Seems to me, you could take a 5U4 and rebase it
> to
> > > use in place of  a 
> > > 5Z3 or make an adapter to plug it in.  Same
> > > fillament voltage and 
> > > current draw and can handle a larger load.
> > > 
> > > Aaron
> > > 
> > > 
> > > John Ruccolo wrote:
> > > 
> > > >Visit our web site - See http://www.njarc.org
> > > >_______________________________________________
> > > >Scott,
> > > >
> > > >**NOW** you tell us that the tube was glowing
> > > >purple!!!
> > > >
> > > >Your're right -- it's dead, Jim (Kirk, not
> > > Whartenby).
> > > >Toss it and get a new 5Z3.
> > > >
> > > >Now, I know what you're gonna say -- "Aw, Gee,
> > > John, I
> > > >don't have another 5Z3." In a pinch, do this:
> Pull
> > > one
> > > >of the 6V6 output tubes to limit the plate
> current
> > > --
> > > >or pull BOTH if you're willing to use
> headphones --
> > > >and use an 80 tube temporarily. I'm sure Dr.
> > > D'Amico
> > > >can fix you up with a nice 5Z3.
> > > >
> > > >Oh, wait, pulling both 6V6's may kill the
> > > headphones
> > > >too. I gotta RTFS. Just pull one for now.
> > > >
> > > >JR
> > > >
> > > >
> > > >  
> > > >
> > > 
> > > 
> > > 
> > > _______________________________________________
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> > > NJARC at mailman.qth.net
> > > http://mailman.qth.net/mailman/listinfo/njarc
> > > 
> > 
> > 
> > 
> >      
> >
>
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