Treasure 300B-Z Vacuum Tube Matched Pair (2pcs) - Silver - Glass - Instrument Amplifier Tubes - Vacuum Tube - Physical Items

Up for sale will be one matched pair (2pcs) of ShuGuang Treasure vacuum tubes 300B-Z (Substitution of 300BC,300BS,300B-T), packed in environmental protection box as picture shown, product of SHUGUANG Electron Group. CO. LTD. Made in China. The"Shuguang Treasure" as a result of Shuguang's 50-year of expertise in vacuum valve design and production. High Polymer Compound Carbon (HPCC) coating is for the first time used on vacuum tube production. Compared to traditional carbon spray technology, HPCC coating will allow greater concentration of electrons, enhance and maintain stability of the electron flow, maximize “secondary electron emission suppressions” from the glass enclosure, in turn reduce effects of electron swirl which generates internal noises from the vacuum tube itself. Improved vacuuming technology during production process to clear signal background. Key assembling process is manually completed by a small number of senior technicians with 30+ years of experience. 60 extra parts selection and matching processes are adopted to ensure premium quality tubes, compared to the Shuguang generic clear glass tubes. Premium Grade matched right out of factory to serve outside of China market. Suggested burn-in time hours. Most changes happen in the first 150 hours.

• The"Shuguang Treasure" as a result of Shuguang's 50-year of expertise in vacuum valve design and production.
• Improved vacuuming technology during production process to clear signal background.
• Key assembling process is manually completed by a small number of senior technicians with 30+ years of experience.
• Suggested burn-in time 150-300 hours. Most changes happen in the first 150 hours.
• Package Included: 2 pcs × “Shuguang Treasure” series 300B-Z Vacuum Tube(Matched pair)