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Greetings to all, I hope that some person can help me to discover the history of the mark Earth Sound Research, recently buys an amplifier of this mark is Solid State, practically not nothing on the matter nonencounter much information so the data that I have are the mark and it modulates 440 to power sistem I.S.C. Audio Inc. made in the USA Farmingdale NY… exists some schematic cases out? Sorry but my English is not good. Hope answer TY.