Well, here it is, here's the amplifier, it's simple but works well and sounds pretty good.
The final schematic is shown near the end of the video. Feel free to take a screenshot and copy it if you wish to.
For anyone asking about the music I used in this video, it can be found here in this small collection of NES chip-tunes I made :https://drive.google.com/file/d/1OKaO...
Disclaimer: Please do NOT attempt to "plug in" a transformer to the mains the way I do. I fully understand the risks involved but I have done this so many times I can practically do it blindfolded, you might not be so lucky.