[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 ...

Testing the replacements in a familiar amp and setup can help determine ... and tech innovations: From AI to DIY projects Their RetroValve solid-state tube replacements are perfect for emulating ...