Those of us who review audio equipment, and even audiophiles who don't, often talk about our reference systems. The term implies a certain level of consistency. If you are changing components every week, your system probably lacks the stability to be a true reference. In the case of reviewers, this presents an irony . . .

Every product listed here has been reviewed in Stereophile. Within each category, products are listed by class; within each class, they're in alphabetical order, followed by their price, a review synopsis, and a note indicating the issues in which the review, and any subsequent follow-up reports, appeared.

Way back in the age when Stereophile's print magazine was the size of a theater playbill, common wisdom declared that the tube preamp was the ideal complement to solid state amplification.