How to calc max current of a winding of a power transformer?

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I have a good size potted power transformer having the following secondary windings but without any specs. I want to use the 390v+390v for a SE amp. What is the easy way to figure out the max current of this winding?
Thanks for your help in advance
6.3v
6.3v
6.3v
510v
390v+390v

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Topic - How to calc max current of a winding of a power transformer? - DMY 09:13:45 02/22/07 (3)

Plug the primary in. - sser2 12:49:43 02/22/07 (1)

Thanks for the info - DMY 18:11:17 02/22/07 (0)

Measure it. - Al Sekela 12:39:44 02/22/07 (0)

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