>
>In message <19990218225337.AAA20049@[209.239.238.103]>, Rich Measures
><measures@vc.net> writes
>>
>>
>>
>>>
>>>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
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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