Looking for 50-100 watts of Tube Power (give or take) for my JBL 4349s

A pair of nicely restored pair of Dynaco MkIII's with 6550's! I have the rare Paoli version!

Just my two bits. There's been several really great suggestions already. I would like to pitch Cary products. I used to sell them in the 90's and always wanted an SLI 80 ever since I first set one up and played hundred of hours of musical enjoyment while "working" there. Regardless of what speaker combo i threw at it, Tannoy, Mission, Mordont Short, NHT, it was always engaging and musical. I finally ordered my own from Cary Direct last year and could not be happier. It's a great match with my Volti Razz. I also owned a very early Cary hybrid CAD 2500A, that was a nice and punchy 80WPC amp. I like the factory support, the fact they're still made in the US. 

The thing about tube amps is that there is a VAST difference in sound among different types and brands, so you really need to do some auditioning to determine what best suits your taste.  For my own taste, I would be looking for something on the warmer, fuller sounding side, given the sound of your speakers.  At the same time, you don't want to sacrifice the terrific dynamics you get from those speakers.  I think you should also seriously consider integrated amps and not just power amps.  Most tube integrated amps are pretty much a tube power amp with switching and a volume control added to the amp and the gain stage from a linestage is really not needed.  

Your list includes some pretty divergent sound types like the leaner sounding Audio Research vs. the Conrad Johnson amps.  

Let me add another brand for your consideration:  look at Synthesis Audio amps.  They make amps that are on the warmer side--rich, full sound, but not sluggish or murky sounding.  They deliver a "big" sound and do a good job of flooding the room with sound.  They have a lot of punch too.  I particularly like the models utilizing KT-66 or 6L6 tubes.  This sound is so much more vibrant, energetic and alive than the sound of any Decware amps I've heard.

The unrecognized heavy weight that is made in California is canary audio. They are held in high esteem in many places just not thought of in North America. Cheap on the used market. Now beyond them look for a high end brand not kids stuff lol. Audio reseach, cary,vac,Conrad Johnson, McIntosh, sonic frontier, vtl, or bat or pathos. The last two are hybrids.

Regards

“My musical tastes are all over the place: rock, pop, jazz, world, electronic, classical. I listen to a lot of symphonic/orchestral”

As a JBL owner (4367) I will say don’t starve the speakers for wattage. Yes they don’t need much power to get loud but the bass punch and control seems better with more power. I don’t have much tube experience… just some food for thought.