[Boatanchors] Baking Transformers

[J. Forster]

If you are baking ONLY the transformer. If you are baking a whole set, the
200F will roast the capacitors. They often need bakeout too. Hence the
lower temperature, longer bake.

-John

============

> Eight hours  @  200 degrees will do just fine. Be sure to let it cool down
> slow.
> Regards,
> Gary
> ----- Original Message -----
> From: "J. Forster" <jfor at quik.com>
> To: "Mark K3MSB" <mark.k3msb at gmail.com>
> Cc: "List Boatanchors" <boatanchors at mailman.qth.net>
> Sent: Monday, November 02, 2009 6:42 PM
> Subject: Re: [Boatanchors] Baking Transformers
>
>
>> Good idea, but, IMO, you need a much longer bake. Tektronix used 24 to
>> 48
>> hours. You need to bake it long enough to let all the moisture escape
>> from
>> the center of the windings.
>>
>> You can easily make a bake oven with a a box and a lamp bulb and
>> thermometer.
>>
>> -John
>>
>> ===========
>>
>>
>>> 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.
>>>
>>> Before powering up (with a variac of course...)  I was thinking of
>>> putting
>>> it in the oven to get rid of any moisture that may be present.
>>>
>>> I've heard 120-140F for 2 to 4 hours.
>>>
>>> What have you guys done
>>>
>>> 73 Mark K3MSB
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>>
>>
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>
>
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