Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Half a century ago, vacuum tubes were very common in audio ...

The K-502 tube amplifier kit was designed as a piece of pine that can be mounted on an amplifier although it would be more suitable to put it in a box. The K-502 tube amplifier kit was designed as a ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. In this age of hand-made, boutique gear (not to mention the enforced confinement), many ...

It was with considerable interest last month that I set out to track down where in the world there are still factories making tubes. My research found them in Slovakia, Russia, and China, and it’s ...