Can this be good first tube amplifier?

What is my opinion about it?
I have listened to three different brands quality tube amps. All three sounded entirely different than the other.

No one can tell you. And, if they could tell you what they think? You will still have no idea if you will like it based upon their taste. The only thing you can ask about is reliability. That is, if anyone owns one. And, it looks like you will probably need better quality tubes to sound its best. From what I read online Chinese tubes usually do not sound that good.

If you have the budget - definitely the Line Magnetic would be my choice.

I have the LM219ia, but my second choice is the LM518ia, or the newer LM845ia. I prefer the sound of 845 and 300b tubes in these models.

With the right speakers (efficient), such as the Proac D2’s, the sound is hard to beat.

See all the superb reviews of these.

Each tube amps with different tube tend to have different characteristic.

It is true that there are many Chinese tubes with glare and brittleness.

But there are also some Chinese tubes with refined sound.

I like some Psane high end tubes but they are not cheap with price over 200$ per pair.

Hello  shkong78
I had it and then I replaced it for a Line Magnetic LM508, wich is a monster and of course in a totally different leage.
Its a very nice integrated valve amp and more if you change the tubes, preamp section first.
I replaced the stock preamp valves for New Psvane 12AU7-TII and New Production Tungsol 12AX7 Cryo and these tubes made a BIG difference and are not expensive. I recomend them a lot.
I also chaged the Power tubes for Svetlana Winged "C" EL-34 and they also made a diference, but may be a little bit smaller.
Once I heard a much more expensive Prima Luna integrated EL-34 valve amp and IMO it didn't sounded better than the Yaqin MC-13S.
I only would recomend to drive speakers with a sensitivity of at least 90 ohm. The bigger, the better, and with a valve friendly impedance curve.
I also would recomend to buy it from a well known dealer. www.china-hifi-audio.com is an option.
Its a VERY nice sounding amp with an outstanding quality-price ratio!!!

Hi shkong78,
   I have the ML-13s paired with Tekton Perfect SET speakers.  

  For a budget tube system, I don't think you can do much better.  I did roll the pre-amp tubes with NOS Mullards and the system sounds much better than original tubes.  

   The Tektons are super efficient and for a low wattage system, it can put out the bass. 

-Joe
here is a review that pushed me into purchasing:  https://wallofsound.ca/audioreviews/amplification/review-yaqin-mc13s-stereo-integrated-amplifier/