Over the years I acquired quite a few different tubes, but which ones are suitable for audio? And which ones are better left for restoring other vintage equipment. Finally I have an answer! Bellow you will find distortion measurements for all of these tubes…

What I was trying to achieve here was to measure inherent tube distortion. To better understand what I mean by saying “inherent distortion” we need to take a quick look at what is the main distortions production mechanism in tubes…

The never ending battle of AC vs. DC heating. What’s my take on the problem? What sounds best to my ears and why? Let’s regulate that once and for all…