[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 ...

With the wealth of cheap and highly integrated audio amplifier modules on the market ... tubes before — we even recently featured a DIY X-ray tube — but there’s something about [jdflyback ...