Getting into Tube Equipment

The amps used in the Grateful Dead's "Wall of Sound" were MacIntosh MC-2300 SS units.  Jerry continued to use the MC-2300 amps for a while after the "Wall" was retired.  For a short time in '72 he used MC3500 tube amps for his guitar signal before he switched over to the more powerful and reliable MC-2300s.

I still have a Dynamo ST70 paired with a PAS 3x From the 70's.  Over the years have has several upgrades, cap replacements, different tubes, etc.  Bypassed tone controls on the PAS, upgraded resistors, etc.  Still sounds the same.  Compared to my more modern kit, the Dynaco stuff is a stroll down memory lane, but not as satisfying in terms of detail, resolution, and dynamics.  Soundstage is good, but the distortion is so high it obscures much of what is available from the source material (the distortion is lovely, second order harmonics adding a certain "lushness" to the sound).

What I have found is that modern SS electronics, properly matched to speakers (the 86dB Dentons will want more power, probably 100 wpm + if you want to listen at high volumes), room acoustics, and how loud you want to listen, will deliver adequate power to get the most out of your speakers.  Choice of cartridge (we are assuming vinyl playback here), cartridge loading, and choice of interconnect cable between your turntable and phono pre (capacitance) can function as tone controls.  Try running your cartridge as unloaded as possible for more detail and air;  increasing the load will change the resonant peak frequency and amplitude in addition to changing the amount of detail retrieval (you will need to experiment because often as the very high frequencies drop in amplitude, it can accentuate the presence of high-mid to high frequencies in the audible bandwidth, resulting in a more brittle sound, a counter-intuitive result).  Eventually, you will settle on a loading scheme that will get you the results you want.

Spend your money on a good turntable, cartridge, and phono-pre.  I am an avowed audio cheapskate, so I am currently using a new Technics SL1200 GR (removable head shell allows me to easily swap carts, RCA outs let me change interconnects, super easy to adjust).  Run that through any competently manufactured modern SS amplification system and you will likely find the sound that you are seeking.  My old Dynaco stuff stays in the closet.

FULL DISCLOSURE:  I am currently using an Odyssey Audio Candela preamp that has a tube gain stage.

I'd give the Harbeth Super hl5plus speakers a listen.  They will begin to roll off at 40Hz, but the bass will be present into the low thirties and beyond without doubling effects and port chuffing.  They will, however, require some power.  If you are dead set on going down the tube path, however, speakers like the Coincident Technology speaker recommended by a previous poster, or the Tektons, or any high efficiency horn type speaker may go better with the "gestalt" of your system.  Of course, you will be missing out on the incredible natural presentation of the Harbeths (which can be obtained at substantially less cost than you will end up paying for the tube rig).