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Update: Simple 5687-based preamp - diyparadise
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Simple 5687-based preamp - diyparadise
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Single Ended 5687 amplifier Photo #4740200 - US Audio Mart
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Audio Note M7 Line Preamp?? - diyAudio
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7868 Tube Amp Schematic
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5687 (2C51) preamp | Technik
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Update: Simple 5687-based preamp - diyparadise