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Patent US8284962 - Electronic bass instrument tube preamplifier
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Build report: tube preamp for bass (or guitar)Preamp schematic amps Ashbory bass schematicPreamp schematic bass est 2009 here.
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Sortaflex: DIY Tube Bass Preamp (2020) | T. Hallenbeck

Bassline - Bass Guitar Tube Preamplifier - H&G Amplifiers

Engel Sound Experiment - Tube bass preamplifier

Patent US8284962 - Electronic bass instrument tube preamplifier

BassesByLeo Est. 2009 • View topic - G&L M-Series Bass Preamp Discovery

Ashbory Bass Schematic