Description: You are bidding on a Cardon mesh plate 585 vacuum tube. The Cardon 585 is equivalent to a type 50 tube. There are remnants of a Sparton label on the tube. It is in good condition, but the tube elements have a slight lean as is seen in the photos. The tube has been tested on an Hickok 533A tube tester. The tube tests good at 1700 micromhos out of the nominal 1500, with no shorts or leakage. Upon testing, there is no apparent blue glow between the tube elements. It is sold as-is.