RCA 5879 Phono Preamp | Page 2 | diyAudio

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

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5687 Aikido & Single PS Circlotron
5687 Aikido & Single PS Circlotron

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5687, Tube 5687; Röhre 5687 ID20809, Double Triode | Radiomuseum.org
5687, Tube 5687; Röhre 5687 ID20809, Double Triode | Radiomuseum.org

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5687 Preamp as I plan to build it. | diyAudio
5687 Preamp as I plan to build it. | diyAudio

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Update: Simple 5687-based preamp - diyparadise
Update: Simple 5687-based preamp - diyparadise

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WE417A or 5842 Triode - Tube Preamp Schematic
WE417A or 5842 Triode - Tube Preamp Schematic

Hybrid amplifier

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Op Amp Preamp Schematic
Op Amp Preamp Schematic

Tube Preamplifier 5687 Led Biased Circuit Diagram |simple schematic diagram
Tube Preamplifier 5687 Led Biased Circuit Diagram |simple schematic diagram

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

RCA 5879 Phono Preamp | Page 2 | diyAudio
RCA 5879 Phono Preamp | Page 2 | diyAudio

AUDIO NOTE M7 Single tube 5687 dual channel bile preamp, 1 stereo input
AUDIO NOTE M7 Single tube 5687 dual channel bile preamp, 1 stereo input

The Tube CAD Journal: E-Mail, 5687 black plate
The Tube CAD Journal: E-Mail, 5687 black plate

Hybrid Amplifier
Hybrid Amplifier