Goldpoint If you want to build the best possible line stage amplifier, then you must check out the superb stepped attenuators made from Swiss made, 24-position rotary switches with gold contacts that are available from this company.

One Electron Excellent transformers for SE amplifier use and a truly impressive power transformer, along with a justly popular SE amplifier kit, make this site worth a visit.

Vacuum Tube Valley One of the best of the near-to-the-ground tube audio magazines. Very professional in the best sense of the word, cleanly laid out, well researched, handsomely illustrated…well worth checking out.

Audio-Related World Wide Web & FTP Sites The most complete listing of audio related web sites around. Period. One stop shopping for audio links.

Pat’s Tube Schematics 1500+ Vacuum Tube and Recording Equipment Schematics. Pat provides an excellent service for those of us that can’t find a schematic for a dear old piece of tube audio gear.

Roy’s Vacuum Tube Page If our interest is in tubes as electronic devices more than as parts for high-end audio, definitely visit this site.

Andrea Ciuffoli From Italy, Andrea’s site is devoted to audio projects he has designed. I your interest is OTL tube amps, headphone amplifiers, or DAC’s, then you will have to check his design.

NUANCE & FLUENCE A do-it-yourself SE tube amplifier and
audio software web site from Turkey.

Steve Bench's Web Page Steve Bench has performed a true service for us tubeholics. His web page is devoted to tube topics that cannot be found elsewhere, such as a battery powered RIAA phono stage or "Directly Heated Triodes operated with lower voltage on the filaments." The part swappers will despair upon seeing experiments, spreadsheets, formulas, curve traces, and solid-state devices in the schematics, but the intellectually rigorous will delight.