I have a Dialogue 2 with all NOS Mullard and GE front end tubes, and various power tubes. Audio Electronics phono pre with all NOS tubes, VPI Scout1.1 with Soundsmith Zephyr, and Martin Logan Electro ESLs, and the amp speaker combo sounds great, but the tubes, and a Running Springs Haley power conditioner have a lot to do with it also, and cables and interconnects. But the amp has no problem at all driving the speakers to needed volumes, with clarity.