The power supply are divided into three modules. One is for the 4x TBA820 (I stack 2 bridge diode to provide 3A current), the other two are for the tube “high voltage” section and the MP3 Player (source). The power supply for the MP3 Player should be regulated with LM317. I will add this one later.
Time for testing. Safety first! Always install the fuse to prevent unwanted problem 😉
Connected to the power supply module one by one. So far the output voltage just right on my needs!