I want to second Phil's comments about selecting the right transformer
first. Although I love to use the parts I have, there is nothing worse than
building a nice amplifier around an existing large transformer, only to
learn that even though it is big it has too much voltage drop.
You could purchase a transformer that meets your specifications exactly from
an unknown source. You will pay a pretty penny for it plus shipping. Be
aware, though, that some transformers which meet the specifications you gave
will not be suitable for a nice amplifier.
Using a surplus or existing transformer is fine - if you are prepared to
test it or at least scientifically research it.
I had a heavy transformer out of an old BTI amplifier that I thought would
be suitable and built an amplifer around it. Transformer sag, however,
turned the project into a real disappointment. Finally removed the
transformer.
Colin K7FM
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