Power Amp or Mono blocks for JBL K2 S9900

Nice speakers and amp.
Some people like solid-state amps and others prefer the sound of tubes. You have to figure out which one you like. Personally I like both and I have systems that are solid-state, tube, and a combination of both.
You have a very good amp, a different brand with more or less power will simply be a different flavor of music and the same thinking goes with a tube set up. Since your speakers are 93 db I believe a less powerful wattage tube set up will power your speakers for example a tube set up with 50 watts per channel. When I have a bit more time I'll make some tube amp suggestions.

Check out some amps or integrated amps from the following (there are many other good companies that I have not mentioned).
Ayon Audio
Rogue
Luxman
Raven Audio
Rogers
Allnic
Pass

Thanks @tweak1 , @larryi  and @lak for your inputs and suggestions. I will see if I can demo any of these. Tried a Luxman integrated before and found it a bit sharp. Went with the Krell because of the bass, which I love. But haven’t tried others..