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Gio sent in a link to this interesting preamp. The builder was able to make the preamp with parts on hand. I’m not sure I would have the tubes, but the rest of the parts are fairly common. [Thanks Gio]

I was pleased with how well it turned out, at 30 bucks it looks pretty professional with the solid gold plated jacks on the black case. A neat feature I added later on is the ability to adjust the brightness of the front LED. The yellow LED is to indicate that the tube filaments are active.

More about DIY 12AU7 tube preamplifier

Marc de Vinck

I’m currently working full time as the Dexter F. Baker Professor of Practice in Creativity in the Masters of Engineering in Technical Entrepreneurship Program at Lehigh University. I’m also an avid product designer, kit maker, author, father, tinkerer, and member of the MAKE Technical Advisory board.

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