Pure Class A SS vs Tube Amp

"...I’m trying to decide pure class A or Tube amp..."

There are lots of tube amps that run in class A. Look for single ended triode or pentode (or beam power) design tube amps. No experience with your speakers but Line Magnetic models with 300B or 845 tubes sound fantastic with high efficiency speakers.

I've never heard any Pass Labs amps, but would love to try a XA25.

I own both a class A SS amps and a class A tube amps.
I owned the Klipsch KLF 30 (unmodified) and one set of speakers I currently use is the Klipsch Forte III's.
While both amps sound very good, I give the edge to the tube amp.
I believe if you stay with a major brand name that has a good reputation you can't go wrong. I prefer not getting into suggesting manufacturers at this time.

Thanks everyone for great response 
@jyprez plinius SA is great especially option to switch to class A or AB
but I think the upgrade and also special dedicated line is little hard or who can do the upgrade for me ?

@lak my only little concern about tube is maintenance and also my two channel is part of 7.2 homes theater set up    I read somewhere that tube don’t have dynamics for movies thanks and I appreciate through KLF 30 fan 
how do you compare KLF 30 with upgrade against forte 3 ?