[AMRadio] Re: 500 Transformer

[Diane Swynar]

Hi Russ,

You're a lucky guy!

But you've STILL gotta watch it when baking paint---the odours are
something else...

~73~ Eddy VE3CUI - VE3XZ





> I have an  old stove  in the basement-  used  to be used for  canning
> etc.   the oven is never used for cooking food  here, so-  perfect for
> baking   transformers and  paint hi.   Russ.
>
>
>
>
>
>
>>From: "Eddy Swynar" <gswynar at durham.net>
>>Reply-To: amradio at mailman.qth.net
>>To: <amradio at mailman.qth.net>
>>Subject: Re: [AMRadio] Re: 500 Transformer
>>Date: Wed, 12 Feb 2003 21:31:23 -0500
>>
>>Jeff,
>>
>>Baking transformers behind the XYL's back is a CINCH---the REAL
>>challenge comes when you're trying to bake on an enamel finish paint
>>job on some enclosure that you sprayed earlier...!
>>
>>Even I must admit to doing such things REALLY early in the morning
>>(when she's asleep), or when she's out on some errand!
>>
>>~73~ Eddy VE3CUI - VE3XZ
>>
>>
>>
>>
>>
>>
>>----- Original Message -----
>>From: "Jeffrey J. May" <jeffreymay at worldnet.att.net>
>>To: <amradio at mailman.qth.net>
>>Sent: Wednesday, February 12, 2003 7:17 PM
>>Subject: Re: [AMRadio] Re: 500 Transformer
>>
>>
>> > Hi John!
>> >   You mean that your wonderful xyl lets you use her oven! 68F here
>> > today!..73..Jeff..W0XV
>> > ----- Original Message -----
>> > From: "John Leer" <jleer at execpc.com>
>> > To: <amradio at mailman.qth.net>
>> > Sent: Wednesday, February 12, 2003 6:24 PM
>> > Subject: Re: [AMRadio] Re: 500 Transformer
>> >
>> >
>> > > Regarding drying transformers etc. I have been drying transformers
>> > > and chokes for quite a few years. I have used both electric and
>> > > gas ovens with no apparent difference in results. I store my spare
>> > > transformers
>>in
>> > > an unheated outbuilding and temperatures here in Wisconsin run
>> > > from
>>-20F
>> > > to +100 so condensation can be a problem in many different
>> > > devices. I first check the resistance from winding to core with a
>> > > small hand held megger which applies about 1000 volts. I find many
>> > > transformers and chokes will have an indication of leakage to
>> > > ground after a year or so in storage. After baking for 4 hours or
>> > > so at 200+ degrees and
>>allowing
>> > > to cool, the megger will indicate infinite resistance winding to
>> > > core.
>>I
>> > > have found a something strange, to wit, if the measurement is
>> > > taken
>>soon
>> > > after removal from the oven , the megger will still indicate a
>> > > leakage resistance. Upon cooling the resistance will usually be
>> > > infinite. The transformers with tar type potting seem to be the
>> > > worst offenders at absorbing moisture. I assume this is due to
>> > > cracking of the tar. John K9XH
>> > >
>> > > Donald Chester wrote:
>> > > >
>> > > > Be careful about using a gas-fired oven to dry out the
>> > > > transformers.
>> > Water
>> > > > is a by-product of gas combustion, and the air will carry plenty
>> > > > of
>> > water
>> > > > vapour.  Better to use an electric stove oven.
>> > > >
>> > > > If you are in no hurry, bring the transformer into a dry, heated
>> > > >
>>room
>> > and
>> > > > store it there over the winter season.  By the time you start
>>cutting
>> > off
>> > > > the heat in the spring, the transformer should be well dried
>> > > > out.
>>It
>>is
>> > > > more effective to let the moisture gradually evaporate from the
>> > > > guts
>>of
>> > the
>> > > > transformer, just as it gradually condensed there when the
>>transformer
>> > was
>> > > > in a moist environment, and there will be less likelihood of
>>abnormally
>> > hot
>> > > > temperature causing deterioration of the insulation.
>> > > >
>> > > > Don K4KYV
>> > > >
>> > > > _________________________________________________________________
>> > > > Add photos to your messages with MSN 8. Get 2 months FREE*.
>> > > > http://join.msn.com/?page=features/featuredemail
>> > > >
>> > > > _______________________________________________
>> > > > AMRadio mailing list
>> > > > AMRadio at mailman.qth.net
>> > > > http://mailman.qth.net/mailman/listinfo/amradio
>> > >
>> > > _______________________________________________
>> > > AMRadio mailing list
>> > > AMRadio at mailman.qth.net
>> > > http://mailman.qth.net/mailman/listinfo/amradio
>> > >
>> >
>> >
>> > _______________________________________________
>> > AMRadio mailing list
>> > AMRadio at mailman.qth.net
>> > http://mailman.qth.net/mailman/listinfo/amradio
>>
>>_______________________________________________
>>AMRadio mailing list
>>AMRadio at mailman.qth.net
>>http://mailman.qth.net/mailman/listinfo/amradio
>
>
> _________________________________________________________________
> Help STOP SPAM with the new MSN 8 and get 2 months FREE*
> http://join.msn.com/?page=features/junkmail
>
> _______________________________________________
> AMRadio mailing list
> AMRadio at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/amradio