[ARC5] Hallicrafters S-38 is dangerous

[hwhall at compuserve.com]

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I had often found dual primary transformers for 120/240 useful for isolation
transformers.
Instead of putting the primary windings in parallel or series,
use one as primary and the other as secondary.
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The sort-of-remotely-possible-gotcha with the dual primaries is they aren't always (maybe not even often) wound separately. Most that I've examined scramble wound the two alternate primaries. So ultimately the only insulation keeping you safe may be the formvar coating on two adjacent turns.
 

 Wayne
WB4OGM