Sugden Amps

I have Altec 620A speakers with an efficiency close to your Klipsch, and I've been looking for the same thing as you... for several years, I used a Sugden A25B (class A/B) which was warm sounding but lacked transparency... I replaced it last year with a Belle Aria integrated which is superior on every aspects, which is normal since the Belles cost more money... Before purchasing it, I thought about getting a Sugden A21 (class A) but I didn't want to deal with the heat since my amp is on all day and my place gets very hot in summer... in SS, you'll probably have the best results with a class A (Sugden, Pass Lab or other brands) or a class D, but the choice is limited in class D integrated ...  

Thanks alaindexe

See if you can find a cayin h80a hybrid amp. 
Yes it’s chifi but it’s very well built and only has 2 tubes in the preamp stage. 
Probably won’t bust the pocket book used as well. 

Definitely look at the Sugden A21 (Signature or SE). My signature has a phono amp---I don't believe the SE has a phono amp. It runs warm but not hot. Extremely musical and well built. It's my first class A and I love it!! Go through @goldprintaudio Great customer service.

Love my Sugden LA-4 pre, with those Klipsch I’d totally think a Sugdan amp would be for you, I absolutely love the Canor Virtus i2, but being tubes... ugh that’s a phenomenal amplifier now with pre outs. Lastly what about a Cambridge Edge A. I have my Azur 851a and it’s an amazing integrated (discontinued) and the edge line just notches all that goodness up a level.

So many choices!

My absolute favorite integrated amps as of now are my Riviera Labs Levante and Technics SU-R1000.

Would love to try a Pathos InPol amp which again sounds like it would be a great choice for you.

Good luck and happy hunting

Let us know what you find.