I know several people who design and build amps in the USA. They have all commented that they could not afford to build at the same quality level as this Cayin.
And talk about bullet-proof design - this amp has survived two KT88 meltdowns and all I had to do was replace the tube - and a fuse, in one case. By contrast, I have a British amp (whose sound I love) that seriously wiped out some power supply resistors when an EL34 failed. The sound of resistor ceramic exploding and the concomitant stench was impressive. It was not insignificant work to repair it.
Not all Cayin stuff is great quality though. I have two Cayin SACD players that are problematic even though the sound is superb. The mechanical noise from the transport is sometimes more than noticeable on one of them. The other player shorted out somewhere so that the only sound it produces is digital noise.
All of this is to say that you should not harbor anti-Chinese bigotry regarding China's high-end audio manufacturing capability. The build quality of Hegel and Ayon is probably better than it would have been if it were built in Europe. By manufacturing in China, they can spec a much better build quality and keep cost down so that you, the purchaser, get the best product possible.
Further, do not think that Chinese engineers can't do great designs. Ayon and Hegel confer legitimacy on their products because the designs is done by Europeans. But good design engineering knows no borders.

