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Lucas, Lyra, and DIY Audio Projects: Revisiting the 5687 Preamp

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Audio Note Schematics - Dr.Tube

Audio Note Schematics - Dr.Tube

Vacuum Tube Preamplifier Schematic

Vacuum Tube Preamplifier Schematic

Lucas, Lyra, and DIY Audio Projects: Revisiting the 5687 Preamp

Lucas, Lyra, and DIY Audio Projects: Revisiting the 5687 Preamp

5687 Preamp as I plan to build it. | diyAudio

5687 Preamp as I plan to build it. | diyAudio

Hifi Tube Preamp Schematic

Hifi Tube Preamp Schematic

Update: Simple 5687-based preamp - diyparadise

Update: Simple 5687-based preamp - diyparadise