Cayin A 300B

I believe the same, Coolhunter, no need to reinvent the wheel. Cayin products prove that a classic approach works great if you put a lot of care and the best parts together. I'm very happy with the quality of my small Cayin and the sound is also great. But I do prefer single ended to a push-pull. I will happily move to another Cayin amp (the 300B) if it stands up against the Line Magnetic SETs. 

I own a Cayin 688R. Only one in the world I think. 

I have owned the Cayin A50T & while they are fine products IMO the Yaqin MS-300C is every bit as good an amp,almost identical build/parts quality & less $...

I'd be interested to hear what rrfrerichs1950 thinks of the 688R, and what tubes he uses in it. The ultimate tube integrated - with a tone control no less.