Shuguang Treasure series 300B-Z Tube (Grade A)
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Premium A- Grade 2pcs Matched in Exquisite Black Box (Selected With High Score of Critical Parameters and Best Matched) "High Polymer Compound Carbon" Technology "Super Alloy" Technology
The 300Bz are the best sounding 300B tubes we have ever heard and the Premium grade versions are the cream of the crop. Each tube is made by a senior factory technician with decades of experience.
Features:
- Gold coated pins to enhance connection over long term.
- 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 surpression" from the glass enclosure, in turn reduce effects of electron swirl which generates internal noises from the vacuum tube itself.
- All parts are selected to the highest grade.
Suggested burn-in time is 80-150 hours.
