[NJARC] Hallicrafters SX-16 PS

[Scott Roberts]

I am going to take a heavy look at the transformer- I have some
suspicions about it: the wax on the bottom, which is dripped out
of it, is heavier since I last looked at it: it is also on top of
connections I just made when recapping. Also, I want to check
continuity through the windings: I tested the mains coil(110AC
in) and it is NOT indicating continuity! It is showing an open-
even though current is coming out the other side. Seems like
there is something wrong. So I am going to disconnect all the
connections, and test continuity of all the windings, and see
what I come up with. I understand from postings elsewhere on the
net that these transformers have a tendency to met out and short,
so I am concerned this may be the issue...

Scott


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

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> The adapter is a straight through type, with the outside tabs,
> and I'd used it last week with no issues. I will take a look
> and
> see- maybe something got inside it, but I doubt it. The blown
> out
> piece of the tube is on the pin which goes to the number 2
> terminal on the transformer. Looks like blue wire: I am still
> trying to find a chart of the transformer wiring and outputs-
> all
> I find is the same one which is on the Hallicrafters schematic:
> which has no values on it... I am checking for a short: when I
> have the DMM set for continuity(beep) I get an alternating ow
> volume beep between the tube contact on the socket, and the
> chassis. (A solid chassis to chassis connection gets a solid
> tone
> beep)
> 
> Anyone got a diagram of the transformer for an SX-16?
> 
> Scott
> 
> --- John Ruccolo <jr6v6gt at yahoo.com> wrote:
> 
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > Scott,
> > 
> > I figured you replaced the caps -- but I had to do a
> > sanity check, just in case. ;-)
> > 
> > Hey, what about this "adapter" you put on the BFO
> > socket? Could that have shorted to something?
> > 
> > I don't think the tube failed on its own (although
> > *anything* is possible). I think something external
> > caused it to fail. By your description, it sounds like
> > the B+ got shorted to ground.
> > 
> > JR
> > 
> > --- Scott Roberts <ng19delta at yahoo.com> wrote:
> > 
> > > Visit our web site - See http://www.njarc.org
> > > _______________________________________________
> > > ALL CAPS REPLACED!!!!
> > > 
> > > The only change I made from last night was I rotated
> > > the chassis
> > > on the bench 180 degrees so I could access the BFO,
> > > and put in
> > > the adapter between the BFO 6J7 tube and socket, so
> > > I could test
> > > the voltages...
> > > 
> > > I will make the checks you just mentioned tonight,
> > > and post my
> > > findings. (I'm hoping my findings include another
> > > 5Z3 tube in my
> > > spares pile...)
> > > 
> > > When I was working on testing last night, I had the
> > > chassis
> > > upside down while I found the problem: then I put it
> > > right side
> > > up and ran it- I wonder if something in the tube was
> > > damaged, and
> > > came loose after it cooled, and shorted it
> > > internally? 
> > > 
> > > Scott
> > > 
> >
> 
> 
>      
>
____________________________________________________________________________________
> Never miss a thing.  Make Yahoo your home page. 
> http://www.yahoo.com/r/hs
> _______________________________________________
> NJARC mailing list
> NJARC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/njarc
> 



      ____________________________________________________________________________________
Looking for last minute shopping deals?  
Find them fast with Yahoo! Search.  http://tools.search.yahoo.com/newsearch/category.php?category=shopping