Tube amp with PSB Platinum T8?

I recently purchased a pair of Platinum T8's and was wondering if anybody has any experience with using a tube amp with these speakers? I'm currently using a Bryston 4bst and Cary slp98 which does sound good but I miss having a tube amp. This weekend I hooked up a pair of Heath W5's and they actually sounded pretty good with these speakers (though I was missing some of the punch in the bottom end). Don't know if it matters but, I listen to most everything and have a 13'x21' room.

Any thoughts would be greatly appreciated.

Per the PSB website, here's the specs:
Sensitivity
(1w (2.83V) @ 1m,
IEC-filtered Pink Noise,
C-weighted)
Anechoic Chamber 88 dB SPL
Typical Listening Room 90 dB SPL
Impedence
Nominal 4 Ohms
Minimum 4 Ohms