01 May 2007

"Beauty" - A 12AX7 Tube Preamplifier

To accompany his recent LM3875 DIY Chip Amplifier (gainclone) project, Bruce has put together a DIY 12AX7 Tube Preamplifier Kit to drive the chip amp. He has named the tube preamp "Beauty", as it sweetened the sound of his LM3875 Chip Amplifier.

12AX7 Tube Preamplifier Kit
For the enclosure, Bruce used a readily available plastic and aluminum project box from Radio Shack. This is the same enclosure he used for the LM3875 Chip Amp. The photograph below shows the Tube Preamp and Chip amp together.

12AX7 Tube Preamp and LM3875 Chipamp
Similar to what Mark discovered with this economical (read dirt cheap) tube preamplifier kit is that you get a very quiet preamp that can compete with ones that cost much more. For more information about this project, see Bruce's project page, "Beauty" - A DIY 12AX7 Tube Preamplifier Kit.

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The Cars - Bye Bye Love (Demo)

1 comment:

  1. That is a neat little project. If you mount the capacitors from the underside of the board, you would be able to have more of the tubes sticking out of the chassis. Good work.