Cube Audio Nenuphar Single Driver Speaker (10 inch) TQWT Enclosure

@rwpollock  Next: both tone and palpability.... a Shindo-Aric cross. : )

"Next: both tone and palpability.... a Shindo-Aric cross. :-)"

Any suggestions?

@rwpollock   I'd look to @charles1dad  and @larryi and others who are advanced and experienced in the area of tube amplification. 

I really like, with almost any reasonably efficient speakers, and some not so efficient, the Synthesis A-40 integrated amp (digital dac included). It utilizes KtT-66 tubes in pushpull to deliver 40 wpc.  If you demand more power their A-100 amp delivers 1000 wpc by doubling the number of output tubes.

I would also hazard a guess that an Audio Note Oto would work well.

@rwpollock 

 I am in the camp of keeping what you currently have. Virtually everything in audio is a trade off to some degree no matter how small. You get another amplifier that gives you more of  “this” but then loses some of “that”. The Audio Note OTO I believe would be a terrific match with your speakers. It is an el84 with its inevitable strengths and weaknesses like any other amplifier.

it could be as good but I don’t see it as better than your current Shindo or Elrog/Aric Audio 300b. . Higher power push pull tube amplifiers would take you in another direction as far as I am concerned. I don’t know that this would necessarily be any improvement with the Nenuphars. It could certainly work out well for you, more likely different rather than better. Just to let you know I am bias positively  toward high-quality low power tube amplifiers. Just me. I believe that you are in a very good place right now.

Charles