Any SS class A experience to share?

I've got to second the Pass suggestion, which is a common one for its tube-like liquidity.
More interesting is that I tried to run my Parsifal Encores with a dealer-recommended Avatar a while back. The spectral trampolining it provided was so severe that none of us could believe it! I finally got out the old RS SPL and carefully measured upper bass and low-treble huge peaks, and a VERY rolled off top octave. Horns were unlistenable!
VAC simply responded that the EL84 (?) is commonly non-linear (even in a well-behaved load like the Verity's!), and that I should try their $9000 monos. I tried Acurus, Krell, NAD Silver, and other SS brittle crap (but at least they were linear!), and found nirvana with a pair of Aleph 2 monos (mono version of the 5 mentioned above: 100/160 8/4, 300w idle EACH!). And YES, there is magic with all Class A. I also use a small portable Class A mic preamp from GRACE that is astonishing in its purity and grace.
It's the Class A more than the tubes, IMO....

Though I don't feel I have personal experience with anything to recommend here, I do notice that many of the respondents seem to be focusing on the class-A request and the fact that Duddley uses tube power now to recommend 'tube-like' gear such as the Alephs, when what he's asking for is bass slam. Class-A or not, at least when it comes to the smaller models such as Duddley seems to want, I don't recall the single-ended Alephs as being noted for their slam.

There's ahuge difference between the well-known bass-shy Aleph 30w 3 and the larger ones. A 12AWG PC helps, too.

As far as bass slam with the Aleph 5; I don't know if I can comment as of yet. The Aleph 5 is a new amp for me (as of about a week ago). I've been running it thus far with the SR17 monitors which don't get down below 40mhz. I also can't comment on the Aleph 3/30 comparison that Subaruguru mentions, since I have not either of those amps. Though the SR17's have a remarkably tight low end for such small boxes, I cannot say I'd equate the effect to that classic SS bass slam that hits you in the chest (not really fair to expect that from a small monitor though). I'd be curious to hear more comments on this (Suabru?) since I've not tried the Aleph 5 with bigger speakers yet. Maybe I'll bring it home and hook it up to my La Scala's! One additional comment I can make regarding Class A, as it pertains to my Aleph 5: They most definitely sound better, and more refined as they get hotter. 1 hour minimum, but many folks leave their class-A's running 24/7 and claim they sound best that way (after a few days running). I haven't really been able to tell the difference past two hours (it sounds great at that point) to two days (sounds the same to me as two hours, as far as I can tell, though my listening has not been so deleberate to really make a really critical judgement), so I save the power and shut them down when I know I won't be listening for a while (the Aleph is in my work system, so it shuts down on weekends). If I heard this amp blind I would NEVER guess I was listening to an SS amp (I would guess tubes or hybrid).

From personal experience of pairings with the Mini Utopia:
* Spectral could be an option
* YBA Passion (stereo)
* Symphonic Line Kraft 250A (the best bass "slam")
* Plinius (the newer model -- SA100?)
HOWEVER,
1) do try auditioning; the Minis are nice speakers (IMO), musical & precise, however I never found them "lush" or forgiving and their bass wasn't designed to go down very far.
2) check for low input impedance (i.e. matching) on these power amps: for example, the Kraft's input impedance is ~10kOhm.
3) Kraft, Spectral & others are wide bandwidth, and will amplify spurious info which in turn will probably be reproduced by your focal tweet!

Good luck!