In spite of our earlier hype, [Olson] seems to be using an external power supply for this mini-amp; but before you count that as a mark against this build, the music you hear him playing in the ...

[Simon] wrote in to tell us about a headphone tube amp that he just built ... [Simon’s] design adds an on board regulated power supply and a volume control for the input. Effort was made ...

When it comes to valve amplifiers, power outputs of around 30W to 50W tend to be the norm. In some instances, this figure ...