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Most regular readers of Positive Feedback know of my long-time passion for vacuum tube electronics. I've enjoyed the musical prowess and sonic chops of contemporary artisan-designed single-ended amplifiers with various output tubes, like the EL84, 45, 2A3, 300B, F2a, and 845 output valves; as well as inspired push-pull amplifiers using KT88, EL84, KT66, EL34, KT90 outputs, and... Read More »

As many of you know—and as the title reference to "The Acoustic Revive Chronicles" suggests—over the years I've written quite a lot about the innovative Acoustic Revive audio accessories designed by the brilliant Mr. Ken Ishiguro in Isesaki, Japan. In fact, I've spent more time writing about Mr. Ken's Acoustic Revive accessories than I have... Read More »

The Duelund Coherent Audio/Tannoy Westminster Royal Special Edition Project article I wrote for Issue 70 of Positive Feedback was the most fun I've had writing about audio ever!  In that amazing project we took a 'no holds barred' approach to building ultra-high performance external crossovers for my Westminster Royal SE loudspeakers using the exotic, hand-crafted-in-Denmark, Duelund CAST capacitors, inductors,... Read More »

The Sophia Electric Family   Sophia Electric is a family owned and operated enthusiast audio company located in Vienna, Virginia, that designs & builds premium vacuum tubes, vintage-inspired Hi-Fi amplifiers & preamplifiers, and low-powered amplification simpatico loudspeakers, all of which are intended titillate the fancy of high-performance audio devotees & music lovers.  Sophia Electric also designs and builds various transformers, chokes, capacitors, and slow... Read More »