I switched in January this year from refurbished Dyneco monoblocks to a Primaluna Dialogue HP powering Tekton speakers with 95 or so db sensitivity. The PL is really some amp, loving it. However I want to add that although I'm not familiar with your Cornwalls from this thread it seems they are efficient and some advice was that you can go with a lower powered tube integrated. I have my system ina fairly large room with a high vaulted ceiling and I sometimes like to listen loud. Upscale thought I'd be fine with a regular Dialogue at 36 watts but my Dynecos were 60 and barely doingbit so went with the HP at 72 watts and I've used every watt. I've had it turned up almost to full a few times, depending on the volume of the source recording. If you like to occasionally recreate a live rock concert at home then don't be shy about watts.
