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

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Tube preamp circuit diagram

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Tube Preamplifier 5687 Led Biased Circuit Diagram |simple schematic diagram

Tube Preamplifier 5687 Led Biased Circuit Diagram |simple schematic diagram

LJ MiniMax 5687 Line PreAmp

LJ MiniMax 5687 Line PreAmp

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

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

WE417A or 5842 Triode - Tube Preamp Schematic

WE417A or 5842 Triode - Tube Preamp Schematic

5687 (2C51) preamp | Technik

5687 (2C51) preamp | Technik

Update: Simple 5687-based preamp - diyparadise

Update: Simple 5687-based preamp - diyparadise