Hi Patrick, thx
i thought you mean the Vgs...lol
the reason why i am asking is following:
i made a normal IRFP M2 since may 2022 and i am happy with the sound. compared to a F5 lateral its a little bit less clarity butthe M2 try to build a deeper sound stage. somethimes its sounding a bit to round.
now i build the exactly same amp but with the fairchild N = FQH44N10...as tungsten audio recommend in ACA premium
and the PMOS FQA9P25.
the sound is much better , i "just" look as low Ciss,Crss etc. and lowRdson to get the bias high because of my 84dB 4R speakers. i do not look at the Xdunctanc for the first step.
i get with both degeneration resistors of 0,349R a bias about 1,8Amps @ 22,7V rail.
with 2,3Amps bias with 0,278mR the get to hot after 1 hour idle 90°C..
my psu consist of 2x300VA the secondary get paralleld. CRC 66mF 4x0,47R 66mF.
i got NMOS VGS 3,55V PMOS Vgs 5,09V
with R13+R14 = about NMOS 4,15V PMOS 5,68 = 9,83V
kr
chris
Wrong place for your question.
You should try at the M2 thread :
https://www.diyaudio.com/community/threads/the-diyaudio-first-watt-m2x.321925/
Patrick
You should try at the M2 thread :
https://www.diyaudio.com/community/threads/the-diyaudio-first-watt-m2x.321925/
Patrick