Alan from DIY Audio Projects built this neat little tube preamp around the 12AU7 or 12AX7 tube. It was built using mostly parts on hand, and can be built using back-to-back 12v transformers to get the high-voltage supply. Total cost was around $30.

via DIYAP Hi-Fi Blog

This entry was posted on Tuesday, November 25th, 2008 at 7:59 am and is filed under audio. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.