[NJARC] Hallicrafters SX-16 PS

[Scott Roberts]

I rechecked st night before I went to bed, after  the computer
was off, and found I did a stupid... I reviewed the wiring
schematic, and compared the wiring: It appears the wiring is not
quite exacty the same, but it is not really too far off. The
factor I stupided on was that turning on the power switch does
wonders for the continuity of the power turns... I really need a
connections diagram of this transformer, rather than just this
unlabeled original schematic...

However, the side of the tube that appears blown, shows both
sides going through turns in the transformer, which should have
continuity, and does not...

Scott

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

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> 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
> > > > 
> > >
> > 
> > 
> >      
> >
>
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> 
> 
> 
>      
>
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