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Single Ended 5687 amplifier Photo #4740200 - US Audio Mart
RCA 5879 Phono Preamp | Page 2 | diyAudio
Universal PCB for Purifi 1ET400A amps | Page 9 | diyAudio
The Tube CAD Journal: E-Mail, 5687 black plate
AUDIO NOTE M7 Single tube 5687 dual channel bile preamp, 1 stereo input
Audio Note Schematics - Dr.Tube