Have you heard/considered one of the Quicksilver preamps? I use the simple Line Preamp with a Crown power amp with good results - neutral, good definition. Unexaggerated bass (bravo!). It rather surprises me that so many are willing to live with the uncertainties of the old gear. I've got "vintage" Luxman and Marantz preamps but they are unstable and difficult to repair. Never know quite what you are listening to. Anyone ever heard Bruce Rosenblit's (Transcendent Sound) "Grounded Grid?" Comes as kit or assembled. MM