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Electronic Projects Tutorials Switched Mode Power Supplies Vacuum Tube Pre-Amplifier Kit Circuits Archive Surplus Stuff Tutorials Ultra Linear Output Transformer. Projects and tutorials. Switched Mode Power Supplies, Vacuum tube and solid state audio amps.

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Pass DIY the Home of DIY Audio, Amplifiers, Preamps and Speakers. Projects by Nelson Pass including amplifiers, preamps and loudspeakers. Site offers information on circuit boards, FAQs and how to articles.

Depository for a variety of audio designs and projects, especially tubular amplifiers. Site offers photo gallery and details on the author's projects, downloadable PDF documents, and technical diagrams.

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