Vin 280V Vout max 131V, I need Vout 260V, measurements done loaded with Puresound MM.
You have to increase the current limit of your SSHV. What is the current consumption of your Puresound MM?
You might need more warp power! Try to give it more juice/current. Maybe try R1=47R and see if things improve.
Star Trek TNG All Good Things... Galaxy X.mp4 - YouTube
Try to give it more juice/current. Maybe try R1=47R and see if things improve.Star Trek TNG All Good Things... Galaxy X.mp4 - YouTube
Seems to me all the current drawn is 12mA and the circuit behaved correctly in that although you increased the idle current the current drawn by the circuit+load did not change. You got 280-131 = 149V across the series mosfet, you better have some serious heat sink while testing, in case the current goes up by whatever reason.
If you want higher Vout then higher value R4 should work. While keeping R8 fix measure the voltage across R4 to figure out the current, then calculate a new suitable R4.
If you're using a 2sk170bl, using R8=300R should give you about a 1mA current going through R4. An R4 of about 240k should put you in the ballpark Vout of 240V. Then you can do some small adjustments of R8 WHILE THE VOLTAGE IS OFF and measure again.
If you want higher Vout then higher value R4 should work. While keeping R8 fix measure the voltage across R4 to figure out the current, then calculate a new suitable R4.
If you're using a 2sk170bl, using R8=300R should give you about a 1mA current going through R4. An R4 of about 240k should put you in the ballpark Vout of 240V. Then you can do some small adjustments of R8 WHILE THE VOLTAGE IS OFF and measure again.