Cayin A-300b vs Muzishare x9

@cb3489 finally upgraded all tubes on X9 :) i got PSVANE Acme 300b and PSVANE 274B Tii. Using Tektons perfect set 15s.  The sound is really good. It improved amazingly. Huge bass sound level and more noticeable details

Congratulations on your successful outcome. I’ve stated before that yes premium 300b tubes are expensive but worth it for the substantial improvement in subsequent sound quality they provide. A good 300b amplifier deserves the use of the higher tier performance tubes. You may as well get the most you can of an amplifier’s potential.

Charles

@cb3489,
After only 18 months in High End audio you became aware of and then acquired a SET amplifier, I’m impressed. It took me much longer to reach that stage but glad I did.

I had a Symphonic Line which is a very good German made solid state amplifier. Moved on to a push pull 40 watt el34 tube amplifier (Which was more musically fulfilling). Next step was a custom 100 watt push pull KT 88/6550 tube mono blocks (Best I’d ever owned up to that point).

Decided to try an 8 watt 300b SET mono blocks  in 2009 and immediately knew this was what I’d been seeking . 12 years later I’m as happy and satisfied as I was on day 1.
Most musically and emotionally engaging amplifier I have ever owned. It brings the music alive. This journey far exceeded 18 months 😊.
Charles

@cb3489, 
 I thought that the Tekton Perfect SET speakers would be a wonderful match with your 300b SET and happy to know this is the case. I'm sure your music reproduction is gratifying and very engaging. 
Charles 

@cb3489, 
I have to believe that the Tekton Perfect SET speakers are a better match with your X9 300b SET compared to the less efficient and sensitive KEFs. What has improved sonically in your opinion (Or am I being presumptuous?).
Charles 

@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

@cb3489, 
Congratulations!
As long as the 300b SET is paired with appropriate speakers I believe that you'll be quite happy with it. Are you using the KEF or have you received the Tekton Perfect SET?
Charles 

Yep, the KEF is rated at 93 db sensitivity so with even modest power, reaching high volume would not be a problem. And no doubt that the push-pull KT88 amplifier is more suitable than an 8 watt SET  amp.
Charles

@cb3489,
I’m a very happy owner of an 8 watt 300b SET amplifier. The KEF  is a 4 ohm speaker that dips to 3 ohms in the bass frequencies. They recommend 50 watt minimum to drive them. In addition it’s a 4 way speaker with multiple crossovers. In my opinion this is not an ideal choice for a low power SET.

I believe you’ll get much more of the capability and attributes from a 300b SET paired with the Tekton Perfect SET 15 speakers. They are intentionally designed to work very well with low power tube amplifiers.
Charles