Hi, thanks for your tip. Where I live, I can take a trip to any number of
transformer shops on one street and if I knew exactly what I was looking for
can maybe find something similar and of decent quality. (The shop certainly
won't know or care!) Problem is, how do I determine what is similar and of
good quality? Primary impedance value, voltage ratio, weight, material? If I
could say, "Hey, I'm looking for a standard push-pull primary that will
handle 30+ watts into for a speaker from 4-16 ohms..." then I could probably
find something, but I don't know if that is what I should be asking.

You have any experience in doing this?