Is it worth building this Elektor NMOS BUZ23 amplifier

[routhun]

Always fascinated by this Elektor amp from late 80s, but never had access to the parts etc to build it. Recently found this schematic again on the web. Idea looks simple, drive the NMOS with a differential pair. Since it uses same transistor types, NPN/PNP, finding the matched devices can be easy. But this one uses a complex bias stabilization and temperature protection schemes. Don't have any idea about the sound quality etc? Has anyone build this amp? what is the experience?

This uses NMOS devices, BUZ23. I am not sure if they are still available, may be they can be replaced by IRFP devices.

[yd1cvj]

Hi routhun,
Did you make it ?

[manicjovica]

Originally Posted by routhun

Always fascinated by this Elektor amp from late 80s, but never had access to the parts etc to build it. Recently found this schematic again on the web. Idea looks simple, drive the NMOS with a differential pair. Since it uses same transistor types, NPN/PNP, finding the matched devices can be easy. But this one uses a complex bias stabilization and temperature protection schemes. Don't have any idea about the sound quality etc? Has anyone build this amp? what is the experience?

This uses NMOS devices, BUZ23. I am not sure if they are still available, may be they can be replaced by IRFP devices.

I made those amps for sale,both for hifi and PA.Very reliable amp, sounds good.Stabilization is simple in fact,an NTC thermistor is inserted in second diferential pair's current source to decrease bias for output mosfets.I used irfp250,irfp240,irf540,irf640,everything works.