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

correct joe

few things to bear in mind w c7’s or super 5’s

harbeths are 6 ohms, dipping to 5 in 100 hz area roughly - need to use 4 ohm taps not 8 ohms on tube amps - very low powered units, single ended, 300b etc etc need not apply unless you are near-fielding

you have decent sized room... i suggest a tube amp with more beef - i have had great luck w primaluna hp, audio research with 4 power tubes per channel, the like... 70-80 wpc range will move and grip the woofers suitably

compact 7 errs on side of warmth, potential bass boom/muddiness, that is why many who want tube sound use tube linestage or dac for that lil bit of magic but let a very good ss amp do the heavy lifting - hegels pass ayre van alstine all excellent

and yes alan shaw is quite the amp-nazi on his forum - hug is a take it or leave it proposition... i chose the latter - he is a good speaker designer but is close minded somewhat intolerant to alternate views to his own

good luck

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

My Harbeth Super HL5 Plus started in my main system with 180 WPC Rogue Audio M-180 tubed (KT120) monoblocks.  They're now in my office with my Audio Research VSI55 50 WPC tubed (6550) integrated.  They sound great with "only" 50 watts, although I rarely play them loud in my office.

I'm currently using Harbeth P3ESR XD speakers along with my Allnic T-1500 Integrated 300B tube amp, 12.5 watts per channel. Sounds very good, I also use a pair of REL T7i subwoofers with all my speakers.

@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 use the P3ESR with Quicksilver 70 watt amps with KT88 tubes. I have used the same amps with the M30.1 and the C7s!

op needs to be clear, which harbeth, how big a room, how loud to play?

it matters

Harbeths C7s with either 40 watt QuickSilver mid monos or an Aric Audio 60 watt push pull. Both amps worked best with KT150 tubes to really make the speakers come alive. Leaner sounding dynamic speaker cables helped squeeze a lot of detail out of the beautiful rich midrange.

Excellent gentlemen, thank you very much.

I had the Harbeth SuperHL5+ driven by Conrad Johnson Premier 12 amps and CJ Premier 16LS2 pre-amp.

Gorgeous sound.   Rich and organic, but controlled and punchy from top to bottom.

I've used Harbeth 40.1's with the following tube amps:

• McIntosh MC275 MKV - 75 WPC (good synergy)
• VAC Ren. 30/30 MK3 - 32 WPC (love this amp, but could have benefitted from more power)
• VAC Ren. 70/70 Sig - 68 WPC (great amp, great synergy)
• VAC PHI 200 (powerful bass, but lacks transparency and air)
• Music Reference RM9 MK2 - 125 WPC (great match and added flexibility to use variety of power tubes to tailor  sound... I preferred KT88's with 40.1's)

I recently sold my trusty 40.1's for the 40.2 Anni's and continue to use the Music Reference RM9 MK2 with RAM EL34 tubes... sounds really good!!!  I have no intention of changing this amp... it's a classic and a great value on the used market when they come available.

I also owned a pair of SHL5's for a brief spell and powered them with the VAC 70/70 Sig (68wpc).   Not surprisingly, the SHL5's just don't sound nearly as impressive as the 40.1's and 40.2 Anniversaries to my ears.

I've tried a few solid state amps with the 40.1's and was not as impressed with the sound quality as I've been with the tube amps mentioned above.