The amplifier is fully functional. Only the transformer marked with red is damaged, which is why it is currently off. Replacing it with a 24-0-24 transformer will fix it. You can purchase parts separately: Amplifier board with four transistors for 750 Taka (950 Taka with casing). Speaker + speaker cabinet for 1800 Taka (900x2). Or take the complete setup for 2750 Taka. If you are interested, please inbox me. Some discount can be given. It has been used by me personally.