Dave:
I also rewind transformers and can do it for you. A little cheaper than
Mr. Dahl.
Regards
Gary...WZ1M
http://Tubes_Tubes_Tubes.tripod.com/tubestubestubes/index.html
http://Tubes_Tubes_Tubes.tripod.com/
----- Original Message -----
From: "Dave Aabye" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, February 09, 2003 1:45 PM
Subject: Re: [AMRadio] Requium for Tranny?
> Hello Gary,
>
> Thanks for the suggestion, which I believe has proven to be conclusive.
>
> I hooked my Variac to the primary and slowly increased the secondary
voltage.
> The caps were disconnect from the rectifiers, so the transformer was "all
by
> itself". At about 700 volts, the voltage started to jump just a bit. At
> maybe 750 v, the secondary emitted a puff of smoke with an accompanying
hiss.
>
> I think it is clear that the transformer is shot. Time to call Peter
Dahl!
>
> Again, thanks for your input.
>
> 73 de Dave
>
>
>
> Gary Blau wrote:
>
> > If you have an audio oscillator and ac voltmeter handy, inject 60Hz at
> > 1V into the primary and measure the secondary. That should help you see
> > if there's a ratio/shorted turns problem.
> >
> > Next would be to slowly bring the xfmr up to full input voltage with a
> > variac, with a light secondary load. If it survives the voltage test
> > then the trouble is likely in the load somewhere (rectifier, etc.).
> >
> > g
> >
> > Dave Aabye wrote:
> > >
> > > Good morning all,
> > >
> > > I need some advice.
> > >
> > > Earlier today my Viking 500 tripped off with the familiar odor that we
> > > have all come to dread. I only lost HV.
> > >
> > > After I got the cover off the PS-Mod unit, I was surprised to see
> > > nothing unusual. Then I started sniffing, and that led me to the HV
end
> > > of the plate transformer. I removed the end cover and again saw
nothing
> > > unusual....only the odor, which by then was beginning to dissipate.
> > >
> > > Resistance measurements lead me to think that some windings may be
> > > shorted. One side to center tap reads 110 ohms. The other reads 95.
> > > The manual says 100 on either side. The HV secondary shows infinite
> > > resistance to ground, but that is with no juice applied.
> > >
> > > What I'm wondering is whether the 15 ohm difference is conclusive. If
> > > not, what other tests might I make without risking further damage?
> > >
> > > Thanks in advance for any advice,
> > >
> > > Dave, W4QCU
> > > Oak Ridge, TN
> >
> > _______________________________________________
> > AMRadio mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/amradio
>
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