When most people think of tube circuits, the first thing that comes to mind is often the use of high-voltage power supplies. It wasn’t a given for tube circuits, though, as a range of low-voltage ...

If you’re doing any serious work with microphones, you’ll typically find yourself in want of a dedicated preamp. [ojg] needed just such a thing for acoustic measurement duties, and set about working ...

We may receive a commission on purchases made from links. High-end microphones are wildly expensive. As of this writing, there are used U47s on Reverb for over $20,000. But parts are affordable if you ...