Diy powerful Class-A amplifier with BD139, 2N3055 transistors, simple circuit 

That's the wrong way to mount that 2N3055, the die is attached to the bottom of the package where the leads emerge. That's the part of the package that should attach to the heat sink. The top of the package #1 is quite thin and #2 isn't guaranteed to be flat so it plays very little part in hear transfer.

Please mention the wattage and ohms of loudspeaker.

Are the sound and bass clear?

De dónde eres tu

Nice video. Sir, please make an amp with mosfet K3473 Or any N chanel class A.

Super projects ever 👍❤️ Better than my content 😜

Please when you show component value use bigger writing please.

👍

Nice projects 🤩💯

It would be good if you put a resistance of 2.2...3.3 kiloohms between the positive terminal of the input cable and the input capacitor (the one that is placed on the basis of the BD139 transistor). Or if even then the sound distortions would not have been considerably reduced, then a resistance of 4.7 or 5.1 kiloohms would go there. Put the input capacitor on the basis of the BD139 transistor, put in series with it a resistor of the values mentioned above, then put between this resistor and the positive terminal of the input cable another capacitor of the same capacity as that capacitor connected on the basis of the BD139 transistor. This way you could reduce the sound distortions and get a much better sound quality.

Very pleasant

Good👍👍👍💪🙏

Quiero aprender la electronica

Tremendo

Good amp, not powerful. Does not even draw 1 amp at 12.6 volts.

Powerful? at 2 W RMS??? LMAO