[AMRadio] Drying out HV transformers / Chokes


GBrown gkbrown at gwi.net
Tue Sep 20 04:38:38 EDT 2005


Jim:
    This is what I do, rewind transformers. I know the problems you had.
Regards,
Gary...WZ1M
----- Original Message ----- 
From: "Jim candela" <jcandela at prodigy.net>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Tuesday, September 20, 2005 1:24 AM
Subject: RE: [AMRadio] Drying out HV transformers / Chokes


>
> My BC-610 plate transformer (open frame) is available free to pick up from
> Roundrock, Texas...
>
> I once rebuilt a Globe King 500 RF plate transformer, and made the
secondary
> winding w/o a ct, to save wire, and use a bridge rectifier. I did a really
> good job with it, and vacuum impregnated it, baked it, and all that.
Problem
> was however that when I went to reinstall the E & I laminations, I only
got
> about 95% of them dudes back on before I ran out of room. The core had
> shrunk on the mandrel when I rewound it. The consequence? The primary when
> excited with 120 vac was saturating (pulled 10 amps unloaded), and was
only
> OK at 105 vac and below. Turned into a door stop, and then landfill. sigh.
>
> So Gary, if you rewind your 610 plate transformer, I have a suggestion.
> Whatever the turns ratio is, maintain that, BUT increase the number of
> primary turns at least 5% to avoid the problem that I had with core
> saturation at normal 2005 line voltage.
>
> Jim
>
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On Behalf Of GBrown
> Sent: Monday, September 19, 2005 5:07 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] Drying out HV transformers / Chokes
>
>
> Read it closely, "MY PLANS ARE TO REWIND IT". Thats about as plane as it
> gets.
> Regards,
> Gary...WZ1M
> ----- Original Message -----
> From: "Geoff" <w5omr at satx.rr.com>
> To: "Discussion of AM Radio" <amradio at mailman.qth.net>
> Sent: Monday, September 19, 2005 5:50 PM
> Subject: Re: [AMRadio] Drying out HV transformers / Chokes
>
>
> > GBrown wrote:
> >
> > >Speaking of HV trannys for the BC-610. I have one with a shorted
> secondary.
> > >My plans are to rewind this hunk of iron and turn the primary into a
dual
> > >voltage, 115/230. This tranny is from the "E" model. Would I have
anyone
> out
> > >there that mite be interested? Also, the transformer has those big
> beautiful
> > >cast endbells.
> > >
> >
> > interested... in....?
> >
> > rewinding it?
> > Buying it?
> > rewinding and retapping it for dual primaries?
> >
> > ya gotta talk a bit clearer than that, to communicate ;-)
> >
> > --
> > 73 = Best Regards,
> > -Geoff/W5OMR
> >
> >
> >
> >
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>
>
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