What tube amp for Harbeth 40.1


I am looking for a tube amp for Harbeth 40.1.  I know many suggest SS amp such as Accuphase, Luxman, Hegel, McIntosh ... etc for Harbeth, but I decided to keep it with tube.  I also don’t think I need a lot of power.  I currently have a 8W custom built 300B and had a 18W Almarro 318B, and to me, they sound fine.  However, I think more power will help, and I never know what I missed until I try it out.  Having said that, I don’t think I need crazy power.  Anything 30-80W is good enough for me.  I am 3m away from the speakers, listen to Jazz at avg 83dB.

i have the following short list:
1) PrimaLuna Evo 400 integrated
2) Leben CS600X 
3) Linear Tube Audio Z40

Which one do people like with Harbeth?  Any other suggestion?

Among all qualities, I value holographic presentation the most.  I really like the feeling as if the singer is floating in front of me, if you know what I mean.  And my current 300B do pretty well in this regards, and I read this is what SET amps are good at.  Will I be disappointed with the above?
Thanks.
gte357s
@pdherer
Exactly listen to the OP! And I hated ATC as well. Grating and didn't think I could listen for hours. Magico is the same ol’ tower speaker I spent the last two months demo'img but overpriced nothing special IMO.


+1 on the VTA amps by Bob Latino. They offer striking improvements in clarity, soundstage, and dynamics to an already very good stock Dynaco circuit.
I have the LTA reference 40 amp paired with a Don Sachs pre.  Stunning combo.
The entire LTA line is excellent.  Especially for the money.  Beats the snot out of the Prima Luna.