Pure Class A SS vs Tube Amp

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.