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Old 29th Dec 2018, 7:18 pm   #12
mhennessy
Dekatron
 
Join Date: Jul 2007
Location: Evesham, Worcestershire, UK.
Posts: 4,241
Default Re: Variac first or Isolation first ?

As you have a variac, why don't you try seeing how the transformer current varies with applied voltage? Give it a go; you might be surprised

Hint #1: there might be something else happening here.

Hint #2: I've already mentioned it.

Hint #3: The solution is to replace the transformer.
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