dhcod, Can you say what it is that must have you at least vaguely dissatisfied with what you have got and why you think a "better" SUT is the solution to that problem? Why, for example, do you rule out the cartridge or your phono stage, or even your present ICs, as a cause of whatever it is that makes you want better. Apart from that, you got some good SUT suggestions from Dover and others who are experienced.
