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Class-A 12AU7 Tube Headphone Amplifier
HC1 High Current Headphone Amp – DIY Recording Equipment
DIY Bass Guitar Practice Headphone Amp - Add preamp to Cmoy? - Thread Gallery | Headphone Reviews and Discussion - Head-Fi.org
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DIY Bass Guitar Practice Headphone Amp - Add preamp to Cmoy? | Headphone Reviews and Discussion - Head-Fi.org
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You Can DIY!: Repurposing an Old Preamp for Line-Level Duty | audioXpress
