Another question

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Hi to all again! :)
I've the following problem..
I've build the following schematic
An externally hosted image should be here but it was not working when we last tested it.

but i've these problems...
Instead of MTP75N i've used a IRF540 and they became very very hot and at the output i've -50 and +80.. -50 is correcty for my turn ratio but +80 no.. what maybe the problem?
Thanx in advance!
 
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