Who's using Harbeth with tubes, what speaker model and how many watts per channel?

I’m appreciating everyone’s posts. Thank you, so much great information.

Excellent gentlemen, thank you very much.

@jjss49 

Yes, everything matters. I am curious about what everyone is using and their experience. 
My curiosity starts with about 35wpc and C7, for example. While listenable, they don’t seem to come alive even at low to medium volume in a 14x16 room. 
I think Harbeth benefit from more power than people think regardless of amp type. I’ve owned C7, 30,1, 40.1 and have friends who own and love them (as I do). 
My hopes of using relatively low powered tubes is probably not realistic in my case. 
I remember visiting someone with a pair 40.1 using maybe 15wpc of 2A3 push/pull tubes and it was glorious with fairly simple music.

 I know posts disappear on the Harbeth forum with talk of tubes and power, etc. so I wanted to see what you guys were using. 

I like where this is going, thank you. Please keep it coming.