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Lucas, Lyra, and DIY Audio Projects: Revisiting the 5687 Preamp
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AUDIO NOTE M7 Single tube 5687 dual channel bile preamp, 1 stereo input
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Tube Preamplifier 5687 Led Biased Circuit Diagram |simple schematic diagram
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Update: Simple 5687-based preamp - diyparadise
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LJ MiniMax 5687 Line PreAmp
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5687 Preamp as I plan to build it. | diyAudio