I got a chance to tune up and listen to the first two diy audio projects that got me to fall in love with the hobby tonight - Paul Carmody's "Overnight Sensations"
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Retro Thing: The DIY Audio Projects Blog
A Few Interesting DIY Audio Projects c. 1955 – Preservation Sound
DIY Audio Electronics from Zynsonix.com: The Millett Jonokuchi Headphone & Speaker Amplifier | Speaker amplifier, Diy audio projects, Diy amplifier
Build Your Own Professional-Grade Audio Amp on the Sort of Cheap - IEEE Spectrum
Mini Block Ultra-Linear Class-A Push-Pull EL84 (6BQ5) Valve Amplifier