Help Me 230vac Smps

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OK Mr. Luka

I´m building it, but, I´m with problems with the push pull driver and toroids.... I have a old 1.5 inches outer diameter green color toroid, 1.2cm (Ae), and I don´t know how much (many) gauss it is.
I need calculate the number of turns of this ring core and the other, that mosfet gate driver. My SMPS work only in 127VAC and it´s half bridge, 13VDC output, opto-zener regulated, I need some 20Amps, in this moment is only 5 to 7 Amps and the BUZ73A mosfets (so bad) bang!! OK?!

I waiting by your help

Thank you.
 
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