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

I’ve had the C7 and used a Cayin tube integrated at 45 watts per channel. The speakers sounded great, never had to turn the volume beyond 12 o’clock. I now have the SHL5 anniversary. I alternate between the Cayin and a Luxman 505ux @ 100 watts per channel. The speakers are very happy with both amps.

@jjss49 

"harbeths are 6 ohms, dipping to 5 in 100 hz area roughly - need to use 4 ohm taps not 8 ohms on tube amps"

Can you elaborate on this. I've been under the impression that with 6 ohm speakers, the 8 ohm taps were appropriate. Very difficult to AB this.