MetroSound ST20 amplifier hears the sound when the power button "pops"

[jacky-bb]

I don't think you are understanding the process tbh 🙂 If its all working correctly then its probably best left.

Hello, this is a triode. Is it PNP? The collector is connected with one of the feet and the iron sheet, and the other foot is the emitter. Do you think so? The collector receives a large DC voltage. For me, a beginner, I want to know a lot,🙂

 

[Mooly]

It is PNP and the collector is the metal case. The two thin leads are emitter and base.

 

[jacky-bb]

It is PNP and the collector is the metal case. The two thin leads are emitter and base.

OK, generally, the collector is to input high DC power. Thank you for your answer. It is amplified through the voltage transformation of the base and emitter. Adjusting the standby DC current of the amplifier is to adjust the DC ampere. Do I think so?

 

[Mooly]

I really think you are going to have to study basic circuit theory and practice and the basic of how transistors operate tbh 🙂

The standby current adjustment is to minimise something called crossover distortion.

https://en.wikipedia.org/wiki/Crossover_distortion

 

[jacky-bb]

Yes, I bought some books and have been reading and learning. I know more about circuit knowledge and understanding. The link you sent me can't be opened. I can't open foreign websites in China, so it's a little difficult,