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Title: Jack Darr, Audio Valve Insights
Review: My best first exposure to audio VT technology, design, and basic electronic trouble shooting was realized through my discovery of this curious book I found in the university library where I attended graduate school years back. I photo-copied almost every page of which I still have. Subsequently, the basic concepts that I learned from this book helped catapulted me into a very busy and rewarding business. An excellent book that I will recommend to anyone.
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