recommended power tube amplifier for vivid kaya 45 speakers

OP, what preamp are you using? This would would have a fairly important impact on which of the amps you may want to go for. I use the Jadis JA30Mk2's with a CAT and find that to be a wonderful combo. Depending on room size, you have some great options.

Atmasphere makes some great points! There are a ton of speakers on the market today that are an absolute bear to drive..even with a ss amp! For example, the recent review by Jason Victor Serinus of the Jadis JA200Mk2 amps exemplifies what atmasphere was talking about. JVS used a pair of Wilson Alexia’s as his speaker of choice with the JA200Mk2’s! This speaker has a impedance drop to nearly zero ohms at lower frequencies, as a result it is known to be severely problematical with any number of amps...and basically tube amps need not apply. JVS in his infinite wisdom had no clue about this... and as such gave the Jadis a luke warm review, complaining of a number of issues that he failed to realize were the direct result of his horrible amp/speaker mismatch!
I have another friend who bought some new speakers at a big price point, basically blowing his budget on them...only to find out that the speakers required a ss amp with tremendous stability into basically a short! His low powered ( well flea powered!) tube amps were not cutting it...and his budget didn’t allow for the monster ss amps required to drive his new speakers...:0(

@haimr One of the better amps for the Vivid’s seems to be the ss Luxman line, that is what the previous distributor would demo them with, and they had great synergy. I like Rowland amps as well, although my experience with the Vivid/Rowland match is limited...so that would have to be demoed before committing.