If you ever wanted to build your own tube amplifier but you were intimidated by working with high voltages, [Marcel]’s low-voltage tube amp design might spark your interest. The design operates ...

The fairly conventional circuit of the tube amplifier. Most tube enthusiasts ... The transformer itself isn’t an audio part, but a small mains transformer taken from a scrap wall wart.

At the time, iffy reliability and even more disappointing tones from many products — including several by big names like ...