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I discovered this Chinese manufacturer https://en.viva-elec.com.tw/stereo-2023.html

I designed a simple amplifier for myself, I plan to order production this month.

[Country]

Country	India
Note	I run a small business that specializes in control systems. I primarily work on cheap 8-bit MCUs (PIC16F, STM8, Nuvoton N76 & MS51). I have dabbled with a few STM32 and PIC24 MCUs in the past. I daily drive Linux and run a home server that doubles as a work server. I would like to join because some of the discussions on this forum has piqued my interests.

You meant did you not?
2SK1530= BUZ901 N Channel, 200 V, 8 A, 1.5 ohm
2SJ201= BUZ906 P Channel, 200 V, 8 A, 1.4 ohm
But what did you use for the  2SK537 N -Channel 1A mosfet?

sllidshow Bob,what he said is obsolutely correct.BUZ901 and BUZ906 is used as output pair.
in 1982's Elektor crescendo article,1984's Elektor mini crescendo article they were not used  any transistor for quiescent current circuit.
but elektor crescendo millenium Edition, they used 2SK537 in quiescent current circuit.

insted of the output mosfet,  2SK537 ,
2SK1530 ,i used BUZ901,BUZ906 without any issues

You meant did you not?
2SK1530= BUZ901 N Channel, 200 V, 8 A, 1.5 ohm
2SJ201= BUZ906 P Channel, 200 V, 8 A, 1.4 ohm
But what did you use for the  2SK537 N -Channel 1A mosfet?

You can always just build up one of Bob's designs without doing any design yourself. You will have to make your own pcb design to suit your enclosure, panel layout, etc. The advantage will be having an in depth description of the circuit operation if you need to do some troubleshooting  after the build or later in use when something breaks down.   

Happy Nowruz 1403
سال 1403 مبارک
اونقدر این پیام رو هر سال فرستادم خودم داره باورم میشه دارم به یک برنامه کامپیوتری تبدیل میشم !

a got the 2006 ed of the book mentioned and some other books
by Douglas Self. i wasn't exactly looking for designing myself
but i will check out the books i borrowed from the internet libraru.

["Designing Audio Power Amplifiers 2019" by Bob Cordell]

Try get hold of a copy of the book "Designing Audio Power Amplifiers 2019" by Bob Cordell. He walks you through a complete design, with the theory, calculations, simulations and measurements from the input through to the output stage. He starts with a basic design and goes through steps to lower the %THD, depending how complicated you want this to be. Years ago, having a %THD of 0.1% was considered to be Hi-Fi quality. Bob shows how you can lower this figure by many orders of magnitude by analyzing the parts responsible for causing distortion and how to improve it. It is a really good read. The parts he used in his designs should still be readily available.  

Alternatively you could also look for books on audio amplifier design by Douglas Self. Both are worth reading.

[Country]

Country	belarus
Note	mcu r&d, microchip xc8 and xc16

The problem is that it may be difficult to source some components. I looked at the 2001 and even here it hard to get most of the transistors what. Like 2SK537, 2SK1530, 2SJ201
From what I have found.
2SK1530/2SJ201 ->IRFP240PBF/IRFP240PBF
also
2SK537 -> 2SK1643/2SK1338/2SK2733 But non of these SKUs is available from mouser(or similar)

You're right, I bought them from a well-known and reliable distributor of electronic components.
Only now have I realized that more than 10 years have passed   .

"Fugit irreparabile tempus"

Ciao
Enzo