PrimaLuna EVO 400 v Cary SLI-100

To @mattsca if you are enamored by the weight and body elements your MC312 amp and Rel subs offer today on your main system, I think its going to take a special tube amplifier with real iron transformers to capture your attention with your Hersey speakers.  This is where personal taste with trial and error begins.  

A friend of mine with all 3 models of Herseys has been through about ten different lower power SET, PSE Triode, and higher power Push Pull tube amps with his Herseys. All of the best tubes in the world too, btw. Each amp type and design gave its own presentation and result. He loved them all for different reasons, delicacy, and more.  Many lacked drive, with "tradeoffs" he reports.   Go figure, today he runs a higher power integrated solid state amp for other reasons, yet now realizes some of the differences going back full circle to where he started. Now has an entire room full of tubes to get rid of, fwiw.    

Best of luck on the journey. :)  

It might be helpful to inject some cross-slang here and see if any insightful daydreams come forth.

"Tubular"

I had a pair of Primaluna EVO 400's for about six months running as monoblocks. The stock tubes left a lot to be desired and a change to KT88 power tubes and vintage Cifte 12AU7's helped a good bit. However, they never really gave me that tube sound "wow" soundstage I had experienced with my old Cary 6 Packs from long ago. I sold off the EVO's and moved on to a pair of CJ LP275M's. Those are my keepers.