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D.I.Y. Tube Bass Preamp/DI #1 | T. Hallenbeck
Bass Preamp Kit: London Power Spectrum tube preamp
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Sound Skulptor: MP566 Tube microphone preamplifier for the '500' Lunchbox - Kit, Preamplifiers, MP566
Frog Tube Preamp 2.0 PCB for DIY – Alembic F2b style – Onboard Power Supply – FrogPedals.com
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12AX7 Tube (valve) Preamplifier Kit
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Build report: Tube preamp for bass (or guitar) | diyAudio
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