The Dawning PLUS series of tube products were designed by Dawning's senior engineer and member of the National Electric Vacuum Standards Committee, Mr. Long Jixue. He created the first of its kind. The latest PLUS series of tubes from Dawning adopts a new manufacturing process and special grade materials. For example, WE300BPLUS, WEKT88PLUS, WE6SN7PLUS and WE6SL7PLUS, which are currently available, are further developed on the basis of the original Rex tube. Most of the materials are used. It...