[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 ...

Speaking of charm, we just love the amp these tubes went into ... vacuum tubes before — we even recently featured a DIY X-ray tube — but there’s something about [jdflyback]’s tubes ...

First made in 1959, this is the best-selling tube amplifier of all ... Uniquely, Dynaco sold its amplifiers in two different ...