I spent a lot of time with Spectral's amps driving the Avalons at Overture, complete with MIT cable system etc. The sound was fantastic. I've also had experience with Spectral systems that were less than optimal. My opinion is that because of their high bandwidth and noise senstivity, extreme care must be taken with ancillaries.
There are a great many tube amps on the market that are the antithesis of slow "warm" and euphonic. The Lamm ML2.1's, Joule Electra amps(Grand Marquis), Tenor and my own Atmasphere MA2 Mk2.3's are prime examples that are extremely resolved, detailed and dynamic. You are painting with _way_ too broad a brush when referring to "Tube Amps" as "warm and fuzzy and oozing with icing". Sure, I could name some that are, just as I could classify some solid state amps as hard, brittle and dry, but I would never generalize in that way about an entire class of products.
What's great is that you found the perfect amps-- for you-- and are thrilled with your choice, but that doesn't mean that tube amps are just something 'Grandma' used to like.
I've owned some fantastic SS amps in my day, Edge, Symphonic Line, Essence etc and all were great in their own way. I've simply found the virtues of HC OTL to be be my cup-a the last few years, and never looked back.
My only caveat with Spectral is that once you step outside the Avalon/MIT realm for ancillaries (and careful AC management) it can get complicated to system match them.
Only my experience, mind you.
Grant