Hello and welcome to ALTA Fidelity!

This site serves as a place for me to capture some of my modifications to vacuum tube audio amplifiers, with the Dynaco Mark III monoblock being my primary showcase.

I'm also in the process of developing prototype PCBs for the Mark III including:

      *   a custom driver board that allows for both 6SN7 and 12SN7 vacuum tubes to be used;

      *   a power supply capacitor board inspired by Sheldon Stokes' board.

Thank you for stopping by.

I'll occasionally have a few amplifiers and assorted parts for sale on Reverb.com: