[Boatanchors] Baking Transformers

[Gary]

Just talking about the transformer. I didn't see anything mentioned about 
the whole unit.
Regards,
Gary
----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Gary" <xfrmrs at roadrunner.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Monday, November 02, 2009 7:16 PM
Subject: Re: [Boatanchors] Baking Transformers


> 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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>
>
>