SS amp or receiver that sounds like Tube Amp

"This post is going nowhere. I will just buy a vintage tube amp and rebuild it."

@jimbennet

What an oddly clueless thing to say. You’ve right from the get go are receiving terrific advice and options from a lot of experienced guys here. Perhaps reading comprehension isn’t your strong suit...

FirstWatt, from Nelson Pass, sells two current solid-state amplifiers based on static induction transistors: the stereo SIT-4 (10W into 8Ω, 5W into 4Ω; note reduced output into lower impedance) and the SIT-5 monoblocks (35W into 8Ω, 60W into 4Ω). Both are class A and dissipate a lot of heat, but provide an extraordinary tube-like sound. To quote Nelson, they're:

emulating the characteristic of a Triode, but operating at voltage and currents directly needed by loudspeakers, eliminating the output transformer. ... As with Triodes, the characteristic curves of the SIT allow operation on Class A “load lines" that can determine the relative values of second and third order harmonics and have little in the way of higher order distortion. It is a now a common observation that the most appealing sound tends to come from a dominant second order harmonic character followed by a lesser values of higher order harmonics.

You can read more about SITs here, and check out the glowing reviews like this one (SIT-4) and this one (SIT-5).

You might very well get the sound signature you prefer by buying one of the current class D with a tube buffer on the input, giving you a modern solution to the problem. If you prefer vintage electronics, might I suggest a Hafler DH-200. This particular model uses Mosfets in the output stage and there are still many of these left in the used marketplace. Further there a few different resources for 'upgrade kits' that are said to increase sound quality quite a bit. Given how good they are right out of the box, improving on the basic performance would put it in rarified company. 

OP

good for you. your Onkyo TX-2500 MKII has performed admirably to your liking with a "wow" moment. I know the feeling as I was comparing my audio note clone 845 power amp with my Pass Xa-25. very close indeed at average listening level. 

If you are happy with the Onkyo, then stay with it, and save yourself alot of money. Shiit Audio has preamps, power amps that sounds much like a tube sound. I compared, and I stuck with the Primaluna. I read another person liked Hegel better, but I compared my EVO 100 integrated directly against a Hegel 390. The Primaluna was the clear winner for detail, accuracy of instruments. A sax on the 390 did not sound right, wth primaluna was perfect. The 390, which way overpowered the EVO integrated, but just was not realistic in sound as the Primaluna. That's my experience. The 30wpc has no problem driving my speakers which are 89db sensitive, 70wpc rated.