sumwhat

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Best Class A Amp under $2,000 used?
Something closer to a Pareto curve.  Its a surface, not a point.  Amplifiers are systems-of-systems.  Transformer technology has evolved.  Discrete components are no longer +/- 5%.  Some are now chip-ed assemblies rather than PC boards. And line w... 
Best Class A Amp under $2,000 used?
You might start with Audio Bluebook on this site.  See what's in the market.   https://bluebook.audiogon.comThe triodes (valves) plus Class A power supply appears preconception more than a criteria which assures a quality experience. Unreasonable ...