Jadis JA30 Mk2, how great???

Indeed, Jadis does make beautiful sounding and emotionally engaging amplifiers. To that, I think their build quality is basically second to none.
IMO, if one is looking for a tube based amp, then these need to be on anyone's short list.

Thanks all for your comments! I have just found how good the JA30 sounds, so arouse me of much interest to get their 300B amp as well. But honestly it seems can't bring enough power for my Sony AR1 speaker which was also newly bought! Anyway I will run them well for the next couple of months to see how changes they will be! 

Hi samhvcc,
As I wrote earlier I’m a hugh fan of SET amplifiers. Matching them with the appropriate speaker is crucial for a successful outcome. Sam I don’t believe that the Sony SS AR1 is designed with the intention to be driven by SET amplifiers.

It a 3 way, 2 crossover (Multi slope per Sony)
4 ohm nominal load (Drops to 2.7 ohm in upper bass and part of the midrange per Stereophile).
88db sensitivity .

Now I’m a proponent of the "Listening is superior to relying on the measurements " philosophy . However specifications/measurements can be used to help develop some initial idea of potential compatibility of matching audio components.

The Sony seems to be a challenging speaker match for most SET/PSET amplifiers. It seems it was built to be driven by higher power/current capable type of amplifiers.
Charles

@samhvcc Like Charles1dad just stated, the Sony SS AR1 is not that efficient a speaker, if you are even considering that the JA30Mk2 won’t be enough power for them, then the SE 300B will only lead to one thing...Major disappointment!
Matching the amp to the speaker is a major factor when acquiring both pieces...how many folk have bought a very inefficient speaker ( or one with a horrible impedance drop) and then acquired an amp that cannot drive the load and been disappointed. Conversely, how many folk have bought/owned a low powered amp and then acquired a speaker that cannot be driven by said amp..very easy to do! ( Usually a costly mistake in both instances!).

As an standard audiophile I owned numerous equipment, Sony & Jadis are just bought recently! My Sony was intended to be driven by my now owned Esoteric Grandioso M1 mono actually. And I paired them with great success! But now I just want to try the JA30, trying how it would go with my Sony.The result, is obviously not a good matching couple, for sure. My newly bought JA30 was supposed to drive a pair of smaller bookshelf, targeting at Franco Serblin Accordo or ATD admonitor premiere, which I am still looking for the right one...