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12AU7 Tube Preamplifier
![12AU7 / 12AX7 Tube Preamplifier Schematic](https://i2.wp.com/diyaudioprojects.com/Tubes/12AX7-12AU7-Tube-Preamp/12AX7-12AU7-Tube-Preamp-Schematic.png)
![StompBoXed - The Guitar Pedal Builders Repository: 12AU7 Tube / Tubed](https://2.bp.blogspot.com/-XtG9QxOfXNM/T-_C6TkbCWI/AAAAAAAABWs/4lOir5hOCfI/s1600/12AX7-12AU7-Tube-Preamp-Schematic.png)
![12AU7 Tube Preamplifier](https://i2.wp.com/electronics-diy.com/schematics/1223/12au7-tube-preamplifier-schematic.png)