5U4G alternative 274B, 5Z3P
Black Tubes?Obviously, the Shuguang Treasure Series tubes are pricier than most new protucdion tubes. Shuguang designed and manufactured the Treasure Series to commemorate their fiftieth anniversary, and they are not rebadged for anyone else. According to the poop sheet there are 65 differences between the Treasure Series and any other tube of the same type from any manufacturer. The obvious difference is that the tubes are black. I initially thought there was black paint in the inside of the glass envelope. It is not paint- it is actually a carbon coating designed to trap any stray electrons inside the glass. I am fairly confident that the carbon coating also helps reduce micro phonics as well. Unfortunately, I am unable to tell you about the other 64 differences the carbon makes a visual comparison of the tubes to others impossible. It also stops less scrupulous sorts from manufacturing counterfeits, a common practice in China. I still remember seeing pictures of Sonny , Maxwell and KDK blank cassettes sold in China back in the early 1980s.
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