There are degrees of valve purism. Pure Sound, appropriately enough, takes things a step further than most by using valve rectifiers in the A30, as well as valve-amplifying components. Is there sense in this? Valve rectifiers waste energy compared with solid-state diodes, they cost more and take up space and, like all valves, they have a finite useful life. Despite all that, they do have advantages in terms of turning AC into DC, with minimal high frequency noise generation.



Link: Techradar