Cayin A-300b vs Muzishare x9

@cb3489,
You have 2 very capable amplifiers, however I do understand the allure of the SET and why you are drawn to it. This type of amplifier if executed properly stirs much musical emotion and gets you more involved/connected with the music. I would be surprised if things do not further improved once you receive the more efficient  Perfect SET speakers. It’s impressive your SET is doing this well with the KEFs.
Charles

The Cayin brand is owned and manufactured entirely by the Chinese government.  Personally, this would be a deal breaker for me though I know for others it is not an issue.(Yes, I know where my iPhone is manufactured, thank you.)

Is the X9 auto bias? 

No. I like manual anyway it feels like i have the control. By the way Tekton perfect set 15s came a couple of days ago. I am really happy with the great match. 

Thanks cb3489. I am very close to getting the X9 to drive my CW IV. How is the X9 bass control compares to your X7? Roll any tube yet?