Dynaco 416 is best they ever made and very rare to be found with the optional capacitor bank. These are in perfect working order as well as excellent cosmetic condition, they are unmolested originals.If you are reading this then you probably already know what these can do and there is not a single speaker system I know of that this will not easily power with headroom to spare not to mention the clean powerful difference an amp like this can make when attempting to recreate a live performance. I can demo for you as these are in use daily for the enjoyment of my customers as my store system.