What are the best tube amps for Klipschorns?

I've been told that tubes provide smoothness and warmth that can't be found in ss amps.

I would certainly agree with that statement. Yet because it is specifically punch & detail that you don't want to give up, I would advise sticking with SS. Others will tell you "my tube amp drives like mad, has incredible detail, etc.", but they won't equal your Levinson in either department. In fact, as much as I love McIntosh as an ideal match with Klipsch, even their SS amps won't be as detailed--nor are they quite as sculpted in the bottom end--as your Levinson. But they would be smoother & warmer.

I think your idea of using a tube amp for the La Scalas is certainly worth trying. What sort of budget are you thinking? I'm thinking that a push/pull tube amp might be best, only because of the relative 'speeds' of the amps. Others may have a different opinion. Again, the addition of a tube preamp can also help greatly to infuse that smoothness and warmth you are wanting.

Actually I have two Levinson 334 amps...one for each side. Perhaps I could sell one, and use that $3000 income for a tube amp. I could also kick in an extra couple grand if necessary.

I am using Placette straight line attenuaters instead of a preamp. The last thing these monsters need is additional buffering. The Placettes allow ALL of the detail through.

Sounds to me like you are very happy with what you have and are just wondering if there is any way to make it better. You could try Pass if the itch is unbearable. My Aleph 30 is ultra detailed and very musical. Dick Olsher (toob man) once wrote that it was the first SS amp he had ever heard that would allow him to forego tubes.
Personally, I'd leave well enough alone. Why tamper with success?

As Paul Klipsch used to say, "what the world needs is a good one watt amplifier. I do not recall what the efficiency of the Klipschorns are but it is probably over 100db. I was very happy with my 1.56 watt SET 45 tube amp when I had speaker of such efficiency.

I am living happily with my 150 watt LSA Statement amp on my 93db efficient speakers, but I still suspect that I would be happier with more efficient speakers and use my 8 watt Reimyo 300B amp. The only low powered ss amp I ever had on my efficient speakers was the 25 watt 47 Labs Gain Cell.

the amp they grew up with...the mac mc275