DIY 12AU7 Tube Preamp

Tuesday, November 25th, 2008

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