[Boatanchors] Baking Transformers

[Joe Eide]

I have to agree with Gary.  I ruined an audio output xfmr in an A-Line 
trying that method.
I had not protected that particular component properly when I had 
cleaned the chassis, and it wicked some water.

Respectfully submitted,

Joe -KB9R

Gary wrote:
> 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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>>     
>
>
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