Hybrid Guitar Power Amp 45W

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Hi guys, I was designing guitar amp for my self, and I need some advice from more experienced guys.
So here is the schematic, please tell me if something wrong or need to be changed?
Here are the questions:
1.Can somebody give me formula for calculating bias current of
MOSFET-s
2.Where to measure it,
3.Could somebody calculate me bias current on the MOSFET's?

Thanks

Hybrid 45W.pdf
 
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