[Boatanchors] Baking Transformers

[Gary]

With due respect to Johns post, I would not recommend this practice. Putting 
voltage on a possibly wet transformer is just asking for trouble, no mater 
how low the voltage is.
Regards,
Gary
----- Original Message ----- 
From: "John Lawson" <jpl15 at panix.com>
To: <boatanchors at mailman.qth.net>
Sent: Monday, November 02, 2009 7:32 PM
Subject: Re: [Boatanchors] Baking Transformers


>
>
> On Mon, 2 Nov 2009, Mark K3MSB wrote:
>
>> Recently acquired an SB-200 parts unit from a 10 year stay in a pole 
>> barn.
>> Power tranny tests OK for shorts and continuity etc.
>
>
>   You might want to consider removing the rectifiers, and putting a
> suitable power resistor across the HV leads, then running the unit up on
> the variac at a percentage of full input power, and let the transformer
> bake itself. The resistor will load the HV, and the remaining tubes will
> load the filament windings.
>
>  I've used this method several times on large HV power transformers;
> afterward they all showed perfect on the hipot tester.
>
>
>   Saves putting the rig in an oven and endangering the "soft" parts,
> drying out already-old rubber, etc...
>
>
>   Just my 200 millidollars...
>
> Cheers
>
> John KB6SCO
>
>
> PS: the filter caps are most likely toast - kits are available, or Digikey
> or Mouser have (much smaller) replacements, and I took the opportunity to
> use units with appreciably more capacity.
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