Among other things granted to the Chinese during the Clinton administration was the relaxation of having to meet FCC part 15 subpart B for electronics. Some Chinese power supplies put out tremendous amounts of RF all across the spectrum. Might check that too if you are having problems with radio reception. When I can get them I always buy Taiwan made power supplies because #1 they are better engineered and built, and #2 they do not radiate RF. They have to meet the RF emissions requirements.
So far I've had a large failure rate of Chinese power supplies because of being under engineered and the poorly made components. Electronics are like everything else being made in China today. They cut corners and mismanage and put out crap clothes, electronics, baby food, pet food, toys, medicines, and every body just keeps letting them get by with it.
Most of my Chinese made shirts don't come with pockets anymore, the thread count of the cloth is lower, the sewing thread is smaller diameter and of poorer quality. The seams are sewn right up against the edges so they rip out in the washing machine and buttons disappear after a few washings too. And if you take medicines ask your pharmacist what the country of origin is. It might surprise the hell out of you. Almost everything I take now (blood pressure and kidney meds) are made in India. That scares the bejesus out of me too but not nearly as much as Chinese made meds.