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Update: Simple 5687-based preamp - diyparadise

Update: Simple 5687-based preamp - diyparadise

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

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

Universal PCB for Purifi 1ET400A amps | Page 9 | diyAudio

Universal PCB for Purifi 1ET400A amps | Page 9 | diyAudio

DIY single tube 5687 preamp set move out to play in the listening area

DIY single tube 5687 preamp set move out to play in the listening area

Tube Preamp Circuit Diagram

Tube Preamp Circuit Diagram

RCA 5879 Phono Preamp | Page 2 | diyAudio

RCA 5879 Phono Preamp | Page 2 | diyAudio

Dynamic Mic Preamp Circuit Diagram at Franklin Long blog

Dynamic Mic Preamp Circuit Diagram at Franklin Long blog