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[AMPS] SB220 Xformer labodomy

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Subject: [AMPS] SB220 Xformer labodomy
From: (Rich Measures)
Date: Sat, 20 Feb 1999 05:46:42 -0800

>In message <19990218225337.AAA20049@[]>, Rich Measures
><> 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


R. L. Measures, 805-386-3734, AG6K,  

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