[Simon] wrote in to tell us about a headphone tube amp that he just built. It is based on schematics at diyaudioprojects.com that were actually featured on Hackaday in the past. [Simon’s ...

And because it was initially designed as DIY kit, it’s easy to restore ... Like most vintage audio equipment, original Dynaco ST-70 tube amps are rarely found in working order, though they ...

There’s a mystique in audiophile circles about tube amplifiers. They can have a very nice sound which is attributed to their even-harmonic distortion, but they are often portrayed as requiring ...