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I've thought about it, but I plan to just stick it on. I want to test how it performs.

Just for testing you could use thermally conductive adhesive tape. But I suspect if they have a recommenced heat sink it will be somewhat undermentioned. Anyway how do you order these Ics? I have for a long time wanted to build a class D amplifier. Ics from Texas Instruments are available at many trusted component outlets   

I've thought about it, but I plan to just stick it on. I want to test how it performs.

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.

Is it your design? Maybe what I would have done is do add holes for some for some machine screws to secure and ensure good contact with the IC and the heatsink.  It should be easy to a drill tap on the heatsink. To get the holes on the heatsink aligned. Just print out the PCB on paper in size 1:1 and use that as a template. Also if you use say 3mm machine screws use a slightly bigger hole say 4mm. And create a keepout era for copper around the holes

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.