Thank you Moof, so you confirm to me that anyone of three Corsair version appearing on Dave Martin's blog is really good working in modulation stage, neither that one use a transistor driver instead latest version with BS170 mosfet. Yes I have tried to change BIAS settings in all way possible, but only with voltage set very very low, modulation quality seems acceptable, so I have tried too to isolate AF LM386 stage before and LM 386+TIP31C stage from rest of transmitter and AF tone until there is regular. Well, what can I say? I will tried "last resort" to consult some experienced HAM in my neighborhood but better will be soon that faulty schemes disappear, 'cause we don't need garbage not really well tested and working that makes you waste time and money.
Thank you.