Any SS class A experience to share?

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

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....

'53, nice post (I'm 1952!).
I've been leaving my Aleph 2 monos (600w idle total) on all this week (it's 10F outside!), and am starting to agree that these thirsty non-PC hounds DO sound clearer ion the top octaves after at least 2 days.
I too routinely provided an hour or two warm-up, as clarity, slam, and extension improvements were easily noticed. After having decided to sell my Discovery essence XLR and keep my newish SPM instead, even though I feared the SPM was a little TOO revealing of junk up top, I now notice that the presentation after LONG warmup is astonishingly good with the SPM. NO top octaves slight edge that required the Essence previously. It's too bad that the SPM requires that I continue to pay for its performance by warming the big guns all the time. Strange synergies and parasitic relationships pop up in this noble hobby of ours, eh?