For what it's worth, I would not recommend looking for a phono amp with a volume control. You will significantly limit your choices, and there's no guarantee that the volume control will be of high quality or that you'll like the sound of the phono pre directly into an amp.
Your Dentons (and the Harbeths you mention) are lower sensitivity speakers, and a tube amp may not be ideal. I would suggest going with a tubed phono stage into a high current solid state integrated amp that puts out 100+ watts per channel (Parasound, Musical Fidelity, Bryston, etc.). You'll get the tube sound that you're looking for, the power to drive your speakers well, and a volume control on the integrated.
Again, just my two cents based on my experiences. Good luck!
Scott
Your Dentons (and the Harbeths you mention) are lower sensitivity speakers, and a tube amp may not be ideal. I would suggest going with a tubed phono stage into a high current solid state integrated amp that puts out 100+ watts per channel (Parasound, Musical Fidelity, Bryston, etc.). You'll get the tube sound that you're looking for, the power to drive your speakers well, and a volume control on the integrated.
Again, just my two cents based on my experiences. Good luck!
Scott