[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 ...

A few years back, [Gio] decided to try his hand at building a couple of tube amplifiers. The first amp was more of an experiment to see how well a DIY single-ended tube amp would sound.

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 ...