This is interesting,if he tests every amp but yet some are not signed,does that mean he doesn't sign every amp or doesn't test every amp or both?Curious as I am a definite fan of the product line,I had a smallbox it had a signiture on the Chassey behind the pre amp tubes.That seems to be the easiest place for a signiture,I have a be100 which is a 2014 and it isn't signed or initialed that I can see,have not pulled it from the box.If it has no signiture when I do would that mean it wasn't inspected by DF? I know it sounds and feels like everything I hoped for.Give it a 10 out of 10.I highly recommend!!!