wrote:



Audio transformers are most efficient when made from very thin laminations of
soft iron,


** Soft iron has not been used since the days of Michael Faraday.

Thin laminations of silicon steel is the norm.




Some time back I wanted to use the mains power as a frequency standard
when adjusting a generator. I was worried about connecting my 'scope
directly to 125 volts so I used a 12 volt out step down xmfr. The
wave form was really distorted.

** You exaggerate.



..... Phil