Who makes a high quality power supply?

I am looking for manufacturer of good power supplies, preferrably a US-
based company.

I bought a Chinese Mastech 30v 10a CVCC power supply. It was cheap,
and upon arrival I see why. I'm new to this stuff and the manual is
pretty useless.

I would like to find a similar HP, Tektronix, or other high quality
comparable type power supply, so I can try to find/buy/download a
manual for one. I bet an HP manual would clear up how to use these
things.

Thanks a lot.

.

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