[AMRadio] Seeking advice on testing modulation transformers


Mike Sawyer w3slk at uplink.net
Thu Sep 21 21:10:38 EDT 2006


A good welding rod oven would do the trick I believe.
Mod-U-Lator,
Mike(y)
W3SLK
----- Original Message ----- 
From: "Mark Foltarz" <Foltarz at rocketmail.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Thursday, September 21, 2006 9:47 AM
Subject: Re: [AMRadio] Seeking advice on testing modulation transformers


Todd,

  Yes, a good point.

  I also found some other transformers of interest including four  nos RCA
transformers that use PP parallel 807 for  an audio amplifier  application.

 Been wanting to build a nice tube amp for a while. Guess I should make sure
these are nice and dry.

  So how would you dry out old transformers?

Mark


--- "Todd, KA1KAQ" <ka1kaq at gmail.com> wrote:

> On 9/20/06, Mark Foltarz <Foltarz at rocketmail.com> wrote:
> >   I am sure the following has happened to all of us.
> >
> >   You build a transmitter or modulator using a transformer that you have
> had
> > around for years.
> >
> >   You then apply power only to find  a short to case or worse on the
> cherished
> > modulation transformer.
>
> Mark -
>
> Dry them out well, first. Bake them, heat them up with voltage, use
> lightbulbs, whatever flips your switch. Most iron sits unused for
> years, as you point out, until that specific project requires it. They
> sit around in basements, garages, porches, and other places where they
> can suck up moisture. And they do suck it up, like a big sponge.
>
> So, not to discount the other postings, but before you do anything
> else, I'd dry them out first. Then test and go forward from there.
>
> ~ Todd  KA1KAQ
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