[Amps] Transformer varnish removal

[Tomm Aldridge]

Phil Harman wrote:
> As a newbie to the list apologies if  this topic has been covered before. 
> 
> For some years I've been modifying ex PC switch mode power supplies to give
> 14v @ 20A for various rigs and amps.  I do this by making a few component
> value changes and rewinding the secondary of the switching transformer. In
> order to do the rewind I have to remove most of the varnish from the
> transformer and to date have done this by soaking the entire transformer in
> mineral turps for a few days. This normally softens the varnish enough  to
> scrape it off, separate the E cores and start the rewind process. However,
> my current batch of transformers don't seem to be effected by the mineral
> turps and I can't seem to find a suitable solvent to soften it. Any
> suggestions as to a suitable solvent. 
> 
> 73's  Phil... VK6APH  
> 
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I used to use a product called "UltraSol" with good results.  It would 
depot almost every epoxy and varnish presented to a beaker of it. 
Google it to see if it still exists.  Care must be taken to make sure 
any windings you want to keep are not damaged though!