Would switching amps make a big difference?

First i ordered a pair of the Zero Autoformers.
Just put them in a few days ago and the results were HUGE with my tube amps.

The trick with getting the highs right is something called gain bandwidth product. With most amps this is pretty poor. This can result in a harsh high end and is why a lot of solid state amps have troubles in this regard, especially when confronted with a low impedance load at the same time. The ZEROs at least help out with the latter. Making the amp's job easier is usually audible :)

I have the 11As and they are awesome!  Highly Recommended!! 

A lot of suggestions about how it would sound "on paper" but in the real world the Raven Osprey is a high end bargain.  You should consult with Dave the owner- he has integrity and will not sell you on something that won't work. 
People said the LS50s wouldn't work with a 20 watt tube amp too but the moment i heard the Osprey bring the KEFs to a glowing, euphonic unbelievably refined sweet sound I had to own each.  
Sound stage to the sky, delicate transparency, as sweet a midrange you could want and plenty of dynamics and slam for a good sized room (16 X 20) 
In short, Yes.  

I’ve had the deHavilland Ultraverve preamp in for a couple of days now, and it’s taken the system to the next level.

While the Zeros helped dramatically by improving the highs, and tightening sound all around, the deHavilland preamp - does an amazing job of making the sound feel live, in the room and for lack of a better word, more tangible. Another great suggestion.

Thanks