No. I have heard tube amps with speakers not appropriate for
tubes and then the same amp with speakers that are and the
amps always sounded best (and the speakers as well) when
properly matched to the speaker. As wonderful as the Cary
may be, it remains a tube amp, and the PSB a speaker that
performs best with high current amps, SS for the most part,
though I am pretty sure a CAT JL2 would drive the PSBs very
well indeed (a high powered, Class A, 200lbs tube amp with
three massive transformers each weigh as much as the whole
SLI - yes a tube amp like that would be undaunted by most
speaker loads - the SLI is not that type of tube amp).
As for the importance of matching amps to speakers,try
listening to B&W 802D with the Cary, then
lets say a pair of Merlin VSMS with the Cary - your
impressions will be quite different, the CARY will sound
like a much better amp with the Merlins. Then try the B&W
with a McIntosh 200 watt SS amp, your view of the B&W is
considerably better than you first thought - even if you
thought it sounding quite good with the Cary - till you hear
with the SS Mac - almost a different speaker, for the
better, driven with the MAC. The Merlin will sound great
with both, but it will clearly show the superiority of tubes
with speakers that are meant to be driven by tubes.