In message <19990220134450.AAA11963@[184.108.40.206]>, Rich Measures
>>In message <19990218225337.AAA20049@[220.127.116.11]>, Rich Measures
>>>>I have a very noisy SB220 power transformer that sounds like a bad
>>>>florescent ballast. Other than being noisy, the amp works fine.
>>>? Such transformers are normally potted in tar. However, you could
>>>have one with a potting void. . On my Web site, a simple method of
>>>potting transformers with polyester laminating resin is described. The
>>>transformer needs to be removed in order to do the potting. The screws
>>>that hold the laminations together need to be tightened before potting.
>>>- later, Len
>>Yacht varnish appears to work well. We submerged the tfr for 24hrs and
>>let it dry for a week or so.
>? I like to use such varnish for the outside of the laminations.
>However, shrinkage during drying is so large that is it not appropriate
>for use inside a transformer. . Polyester laminating resin does not
>have this disadvantage.
>- later, Steve
Good point - our need was only external protection.
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