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

Curious what current consensus is regarding the above question.

Thank you.
FWIW. I think it helps a lot if you use the same brand preamp-amp particularly if going with tubes. Perfect synergy, zero issues, and  minimizes costly mistakes. 

Best Harbeth sound from tubes came from a pair of MC 60s my PE upgraded according to scientific principles to take advantage of the wide bandwidth output transformers.

"upgraded according to scientific principles" ...  whaaaa??? please elaborate ... hee hee hee
Sorry, that upgrade information is proprietary. Hint: it is does raise the output power considerably. And, the cosmetics of the amp are not changed!