Anyone experienced the Luxman MQ-300 or/and The Air Tight ATM-300R?

No matter how good the Engsrom Arne sounds "brand new from the box".  IMO there’s no question that it will improve as hours of use begin to accumulate . It will most certainly relax and open up . This has been my experience with new amplifiers and especially those utilizing output transformers.

I suspect that both of these amplifiers are outstanding across the spectrum. The Engstrom representing uber level 300b sound quality in push pull configuration and the Luxman doing the same in SET configuration. I don’t see how one could not be absolutely thrilled with either driving an appropriately chosen speaker.
Charles

h_bomb,
I can understand your preference for the 300b compared to the KT 88 amp you currently have. The KT 88 is a very good sounding tube if well implemented. However IMO a well implemented 300b is quite formidable and alluring 😊. I was a happy owner of a KT 88/6550 push pull amplifier. Once I got my 300b SET thers was no going back. That was 10 years ago. I believe that you will enjoy your Luxman SET amplifier for many years.
Charles

Hi h_bomb,
You’ve confirmed something I’ve written numerous times on this forum, you just have to audition audio components and listen for yourself. What satisfies one listener may not satisfy another. Simply too many personal taste/preference factors involved. I’m glad for you that the Luxman 300b SET and your Devore speakers have resulted in such a successful pairing for your needs and desires. Nothing ventured nothing gained.

"Little Sophia"  300b SET vs the Luxman SET, no doubt that power supplies and output  transformers differences are a major factor favoring the Luxman amplifier. The Luxman is probably 2 or 2.5x heavier.
Charles 

Well, given your listening levels and room size who knows? The pairing could ’possibly’ meet your needs/expectations. . It will be interesting to see how your current Luxman compares to the MQ-300 and or the AirTight SETs.
Charles

H_bomb,
Your current amplifier is a 25 watt push pull circuit. So probably about 4 or 5 db more than the 8 watt MQ-300. If you’re listening at your typical SPLs with the volume control (VC) at the 9 o’clock position it suggests that there’re is excessive gain in your system. You would want to utilize much more range with the VC.

Interesting the 8 watt MQ-300 is nearly double the weight of the MQ 88C!! This certainly tells you something about the size (And presumably quality) of the transformers and power supply section. As I noted yesterday the Luxman MQ-300 seems to be an all out effort premium tier  SET amplifier. 

What are your typical listening levels in your 14 x 16 ft Room? You have nothing to lose with an audition with your speakers. This would settle the matter one way or the other. 
Charles

Keithr,
I looked up the speaker’s specifications and sensitivity is 91db and impedance load is 8 ohms with a minimum of 6 ohms. So sensitivity is really  on the fringe  borderline. The speaker load is a relatively easy one. Room is 14 x 16ft .

If the OP is really interested in using a SET amplifier I’d suggest considering a good quality 845 ,805 or 211 output tube based amplifier. In the Dagogo review by the "Beatnik" he used four amplifiers and said that the best sound was achieved with his First Watt S.I.T. 3 which is an 18 watt solid state amplifier.

The above mentioned/recommended tubes will provide typically 20 to 30 watts (845 And 211). The 805 tube will yield 40 to 45 watts as an SET. Of course with these SETs the quality of the output transformer and power supply are major factors to recognize.

Back to the OP’s question, I believe he’d need to hear the two esteemed 300b SETs with his speaker (Or one with very similar specifications ) to determine if the pairing is feasible. I'm a 300b aficianodo but in this circumstance the bigger higher power  transmission output tubes may be more suitable. 
Charles

Both of these 300b SET amplifiers are very highly regarded and receive universal praise. It does seem though that the Luxman MQ 300 gets exceptionally high compliments and admiration. It is a top tier effort from Luxman who seem to have gone all out to make it a state of the art SET. People who have actually heard it say it’s outstanding. I have no reason to question this and I suspect it is truly special. Good luck to you in your search.

Is the Devore Super 9 sensitive and efficient enough for these 8 watt SET amplifiers to fully demostrate their considerable capabilities?
Charles