Concerning:
"Heat will happen, and maybe failure.
It is not advisable to directly parallel two same-kind transformers,
and parallelling two dissimilar transformers is a real bad thing. The
effect, if there is any voltage difference, is like a shorted turn or
turns.."
I have personally built and used HV power supplies with paralleled
transformer secondaries and experienced no problems of any type. Small
voltage differences are 'equalized' by transformer losses. In any case,
they can be easily tested and determined in advance before building.
73, Roy K6XK/0
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