Will a PS 300 provide enough juice?

I have a PS300.If you draw more than 200 watts,it would overheat-especially with an amplifier.The PS 300 should be used only with sources,even preamps are slowed down by it.
I would try using the Primaluna with a top notch isolation transformer rated at 500-1000 watts.

No it won't.

No, it will certainly restrict dynamics and make it sound rather flat if it works at all. The 300 will work fine for your front-end gear, but not for a tube amp even of this size.

Thanks everyone for your response, most helpful. In short, I'am looking to regulate voltage on a tight budget. Looking at PS products(used) and Furman. Any other recommendations?

http://cgi.ebay.com/SOLA-MCR-1000-Mini-Micro-Computer-Regulator_W0QQitemZ380122822518

Probably too noisy for the living room. Best way is using a hard-wired unit in a non-occupied room (garage, basement ...) and dedicated line. Used portables like that can be found dirt cheap though. I have the same for the plasma that draws over 600W.

Wouldn't generally suggest under 2KVA to supply an amp but the "One" only draws 300W.