Well, for “starters”, the 2SK3567 has a bipolar zener protecting the gate from excessive gate-source voltage. The VMAX of that is 30 V. Its hard to kill it in practice.
Looking up the IRF740 you have http://www.vishay.com/docs/91054/91054.pdf … and its micro-diagram doesn't have the protective Zener. Blow the gate oxide, and there goes that parade. Its a biscuit.
The IRF822 only has a 20 volt gate-source absmax rating. And no zener. I've gotten so used to deploying fully protected ("faultless") MOSFETs that I've dropped including protection circuitry for them in diagrams. Both of these may be blown devices, now. The 2SK3567 will likely still be good.
Again, measure a few voltages.
GoatGuy
Looking up the IRF740 you have http://www.vishay.com/docs/91054/91054.pdf … and its micro-diagram doesn't have the protective Zener. Blow the gate oxide, and there goes that parade. Its a biscuit.
The IRF822 only has a 20 volt gate-source absmax rating. And no zener. I've gotten so used to deploying fully protected ("faultless") MOSFETs that I've dropped including protection circuitry for them in diagrams. Both of these may be blown devices, now. The 2SK3567 will likely still be good.
Again, measure a few voltages.
GoatGuy
Okay, I tried again but it seems working with IRF740 (I used a 12 volt zener G-S). Output voltage increasing until 181 V (with 200k/200K voltage divider). Input voltage is 370 V coming from two RC after diode bridge. The strange thing is that load resistor here must be high, that is > 50k instead 33k otherwise my multimeter becomes "crazy" and doesn't show any number on the display (as it's off range). What could be it?
At the end I used a BU808 as voltage regulator (as capacitance multiplier) because I shorted the LR8N3 by an accident on the breadboard.