[NJARC] IF Transformers

[salb203 at aol.com]

I have used 100-120pf with great results. As long as you can peak the 
IF can at 455khz then yoyu are in business.

Regards,
Sal


-----Original Message-----
From: john ruccolo <jr6v6gt at yahoo.com>
To: New Jersey Antique Radio Club <njarc at mailman.qth.net>
Sent: Mon, 16 Jul 2007 8:22 pm
Subject: Re: [NJARC] IF Transformers



Visit our web site - See http://www.njarc.org
_______________________________________________
Hello Nicky, Marty and all,

Marty -- execllent answer!

We determined at a long-ago clinic that disc caps of
about 100pf each will replace the wafers. I don't
think the value is that critical. I think I had a
couple of 91pf caps handy, and we put 'em in and the
set worked fine. This was years ago, when the clinics
were still in Freehold. The set was owned by our VP,
Richard Lee, and I think Rich and I spent the whole
damn day working on it! But we had fun. To give credit
where it's due, I think Al Klase determined the value
range for the caps.

--- radiomf at comcast.net wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> The radio industry did nothing to correct the
> problem. They were producing equipment with 90 day
> warrentees expected to last only a few years. The
> equipment usually would not present the symptoms for
> many years. Varying designs in IF transformers and
> materials. may have accidentally cured the problem.
> Marty F.
> ps Not all Ktrans type transformers go bad. alot
> depends on storage conditions (  ie humidity )
>
> -------------- Original message --------------
> From: Nick Senker <ns539 at earthlink.net>
>
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > I just finished reading Walt Heskes interesting
> and informative article in the
> > ARC Jan 2005 about post war IF transformers with
> silver mica caps. This was
> > especially interesting to me because I had just
> encountered my first case of
> > 'silver-mica disease'. The report by Walt was very
> thorough and well documented
> > - thanks Walt!
> > My question is - what did the radio industry do to
> correct this problem?
> > Nick Senker
> > _______________________________________________
> > NJARC mailing list
> > NJARC at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/njarc
> _______________________________________________
> NJARC mailing list
> NJARC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/njarc
>




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