Best integrated tube amplifier, under $3,000.00. No phono needed. Could be used, too.d

A lot of good suggestions here..there is a nice used Ayon Spirit III gen IV for sale on Audiogon right now that would probably give you enough power in either pentode or triode mode depending on your preference

Just bought the Octave V40 mentioned a few posts up (it was in the mail at that time). Replaced the power tubes with Gold Lion reissues. Figured I’d share my message to the seller:

”KT88s arrived a day early and have been in since lunch. WOW! Fantastic. All bias adjusters work fine. Really good sound. I’ve been working backwards from the source/streamer/DAC side of things and just pulled the trigger on the Dynaudio Special 40s. This amp is the last step. Think I’m good for awhile. Looking forward to some relaxing time with the music. Very pleased!”

I only have experience with a few amps but certainly can vouch for this one (in my room, Schitt Bifrost Multibit DAC, Airport Express streamer with Wyred 4 Sound Remedy Reclocker, Signal and Blue Jeans Cable). Glad to hear why I’m seeing Dynaudio and Octave together in a lot of photos online.   

PrimaLuna would be my suggestion. I have their pre-amp driving 2 of their mono blocks. Very happy with sound, build quality and looks.

My speakers are rated at 86, and is for a small bedroom system, maybe 12x14 feet is size, and has appropriate room treatments. I would imagine anything 25 watts or above would be sufficient.

I would go with something of at least 50 watt/Ch for headroom. I have speakers of the same sensitivity in a similar-sized room and the meters on my SS do occasionally surpass the 100 watt mark, and I don't often listen above 90db peaks. 

Yes, you can typically get away with less power with a tube amp but that's really only due to their soft-clipping characteristics, otherwise, watts are watts and additional headroom will result in a more relaxed, confident sound. 

I had the Cronus Magnum II for a while, it had some audible hum, but otherwise sounded nice with upgraded NOS tubes. I sold it though because I concluded I prefer my 50 watt/Ch Cayin A88T for its greater transparency and dimensionality. Cayin are not very well known but they're essentially the house-brand of the factory that makes Prima Luna. Their amps are built like tanks and have some of the finest point-to-point wiring you're going to find in this price class. Mine was built in 2006 and hasn't needed any servicing other than new power tubes. 

I don't claim to completely understand the relationship between speaker sensitivity and amp output power but there are some observations on that in this review of the Raven Audio Nighthawk III driving Dynaudio Special 40s which are rated at 85dB, similar to your speakers.

https://www.stevehuffphoto.com/2019/10/30/hifi-the-raven-audio-nighthawk-mkiii-integrated-amp-review/?fbclid=IwAR2Wt9rCAq0WaQYVJh22kZRVydhh7ExAT-cpkHJHVCwRCn1glzU2FxUn4LY