Thanks for the suggestions. I'm currently using an AR LS-15 preamp, Mesa Baron amp, EAR 834P phone pre. I have a backup pre, a DB Sytems 2B with excellent tone contols, which was very good in its day, and generally considered better than anything by Carver, but it is a high-feedback ss design, not equal to the AR/EAR. I was hoping for something I could potentially afford that wouldn't be too much of a step down. I have tried various preamps and devices over the years, always been disappointed at the electronic "veil" all forms of eq introduce, not least of which are phase issues, so I am aware of the downside of tone controls. In theory, flexibility could more than make up for it. I will (save up and) look into Mac and Accuphase. The points above about the Mac's flexibility are pretty persuasive.
recommend full featured preamps?
I have about decided I really want tone controls and a balance knob, and seek recommendations. I often listen late at low volume (so some bass boost is desirable), and on many records the tone or balance is off. I prefer tubes but am not so sure it matters any more. An included phono section, to eliminate an interconnect, seems most reasonable. In other words, a premap like they used to make. Not really aware of anything besides McIntosh that has all these features and would appreciate suggestions.