Below is a link to Mark Levinson's Red Rose Amps several of which were made by Korsun which is now Dussun. I had a Bada tube hybrid that was the same as a MF amp. There were some slight changes in it's face plate and instead of MF it read Tube Fidelity.

I've bought Chinese gear from US dealers and from China. The only difference I found was the huge mark up from the US dealer.

There are Chinese ebay merchants who sell Shengya gear cheaper than Cattylink.

http://www.redrosemusic.com/amplifiers.shtml