Why do most professional amplifiers use ring transformers instead of switching power supplies?

In fact, the research and development of power amplifiers began with the use of switch mode power supplies. Due to the high cost and poor low-frequency characteristics of switch mode power supplies. And there is also a fatal weakness that audio amplifier equipment cannot tolerate, which is that it can generate strong electromagnetic interference. Of course, switch mode power supplies can be used on low-power amplifiers with low requirements.

The advantages of Huanniu transformer are low magnetic leakage, low noise, fast heat dissipation, high efficiency, and relatively low cost. When leakage occurs, the Huanniu transformer only has a slight tingling sensation, while the switch mode power supply has a severe stinging sensation, so the switch mode power supply needs to have good grounding technology. The circuit of the Huanniu transformer is simpler and has a lower failure rate compared to the circuit of the switching power supply. So, the Huanniu transformer is often irreplaceable by switching power supplies.

Ring transformer amplifier