This tube is an absolute wonder. Classic single-plate 2A3 construction with a modern 40 watt plate dissipation rating. It's detail is even better than the 300B which we thought was impossible... Very warm and liquid sounding. We loaned a pair to David Bardes for a review he was doing on 2A3 amps for Vacuum Tube Valley magazine. He compared them to the chinese 2A3's and others. After trying them they remained in the amps for the remainder of his review simply because there was no comparison, the JJ 2A3 was hands down a far superior tube.