Good Suggestions for Tube Amps under 6k

I would go for Atma Sphere MP-3 preamplifier + Atma Sphere M-60 tube amps. MP-3 is also the best preamplifier you can have for your money and probably the best value for $$$ in audiophile world. If you need more power or you want to save some USD, you can replace M-60 with Atma Sphere Class D. Deadalus speakers usualy have 8 or 6 ohms and, more importantly, a flat impendence curb. In this situation OTL amplifier such Atma Sphere M-60 shall work just fine, and will provide you all benefits of the tube technology without any disadvantage. Speaking in general, tube amps are happy with high efficiency / high impendance speakers. A good tube preamp such MP-3 will sound (much) better than almost any solid state preamp. Keep in mind that preamp is the "conductor" of the system.

Primaluna

@gregjacob   The LTA Ultralinear + is on sale for 10% off until April 30. I noticed that when i researched it FWIW. You save $765

Lampizator 211 Balanced Monoblocks.  Tube amps are excellent and the synergy with the Lamp DAC will be fantastic.  I listen to them on Daedalus Apollos.  I'd part with for $6K, they are $18K new and can't order them this year from Lamp. Interested let me know.

Are you speakers sensitive enough for an SET?  that is a key question.  Tube amps are divided into 2 classes, SET and class A/B.  SETs are the main venue of "tube amp magic".  

Stay away from primaluna and other amps built on circuit boards.  Go with simple point to point circuits.  Get Manual bias control.  Look for the simplest circuit with the fewest components in the signal path as possible. 

Jerry