Pure Class A SS vs Tube Amp

Having just recently purchased the Pass xa25 I can attest to the sound.  Tight bass, amazing resolution and clarity.  A 'you are there' quality to the sound.

Damn, I got in here to opine and saw all the best commenters have already done the service.  You've gotten really good advice... 

I'll just add my voice to the chorus suggesting Nelson Pass' First Watt line if you go SS.  If you do decide to go with Pass or First Watt, I'd encourage you to send them an e-mail with your speaker model (and specs) and ask which amp they'd recommend.  A wonderful company that's always happy to help people enjoy better sounding music (even when it hurts their profits).

And because Ralph ( @atmasphere ) doesn't want to push his own products, I'll note that if you go with tubes, you should also consider the Atma-Sphere S30.  

SS as i hear the amps, are ~~Dinosaurs~~~ back in the 70's, yeah we loved our Marantz,,,but now with so many stunning tubes amps, its a  easy choice. 
now with your 100db, you could go in any direction, with 805;s, 845's, 812's, etc. . ,  superior match  is a  Single Ended 845/300B combo from Cayin @ $3K.... works as both intergrated and pure amp. 
Thats cayin for ya.

No one has mentioned Primaluna yet. Any reason they wouldn’t be a good fit for the OP?

really enjoying mine at the moment...