Here it is, article, as I have understand, that been wrote by Galen Carol
[size=medium]Sophia Electric Mesh Plate 300B Tubes [/size]
[size=small][size=small]There is a fair amount of confusion surrounding the popular Mesh Plate 300B tube. Some background is in order to clear the air. The story goes like this. [/size][/size]
[size=small][size=small]In 1999, with funding from a Taiwanese businessman, the Allmusic Company was formed to develop a unique 300B. Designed by a retired Chinese engineer (Mr. Z. Liu), the Allmusic tubes were manufactured in a factory located in Tian Jin, China. Though a robust design in theory, the early incarnation of the 300B proved problematic. Tubes were failing at a high rate and sales fell, resulting in a collapse of the venture. [/size][/size]
[size=small][size=small]Enter Sophia Electric. Sophia Electric’s Richard Wugang recognized the promise of Mr. Liu’s design and in 2001 the two established a relationship intent on making the unique tube a success. Now, backed by the significant technical expertise and resources of Sophia Electric, reliability issues and performance optimization could be addressed. To make the venture viable for both companies, Sophia Electric arranged to purchase 100% of the tubes that met their rigorous specifications. [/size][/size]
[size=small][size=small]In the beginning, Richard Wugang considered both the ST shape glass envelope and the globe style tubes. Sophia Electric opted for a unique globe style envelope for their 300B mesh plate design to distinguish their tube from the rigid plate designs offered other Chinese and Russian manufacturers which used the ST shaped glass. Tests of these less advanced designs revealed the small dimensions of the envelope sacrificed sonic performance, especially soundstage. [/size][/size]
[size=small][size=small]Word of the new tube spread like wildfire across the internet and by June of 2001 the 300B mesh plate tube was recognized as something special (one review tested it against other 300b tubes, including the venerable Western Electric, proclaiming the mesh plate tube the overall winner). It was during this initial rush of popularity that the tube became known as the TJ Mesh Plate 300B. Rather than a brand name, "TJ" was simply an abbreviation for the city in China (Tian Jin) where the tubes were made. [/size][/size]
[size=small][size=small]In August of 2001, one of the (many) dealers selling the Mesh Plate 300B tubes registered "TJ" as his trademark. Though not involved with the design or manufacture of the tube, the dealer became quickly associated with the tube, with many assuming the TJ tubes they supplied were made by the owner of the trademark, which was not the case. [/size][/size]
[size=small][size=small]All tubes are not created equal, and just like any complex hand made product, tube to tube performance will vary. Through the initial agreement with Mr. Liu, Sophia Electric had the rights to select the very best tubes for their own clients. Thus the cream of the crop are chosen and sent to Sophia Electric in the US for further testing and grading before a 30 hour burn in. These steps insure the tubes offered by Sophia Electric are the best sounding and most reliable 300B Mesh Plate tubes available. Indeed, the tubes are so well inspected, graded and tested that Sophia is able to offer a full one year warranty. [/size][/size]
[size=small][size=small]As good as the Globe style tubes are, further research and development by Sophia Electric has produced a new tube that is even better. The latest generation of the Mesh Plate 300B from Sophia Electric is the Princess 300B. [/size][/size]
[size=small][size=small]Sophia Electric discovered that the shape of the glass envelope, the size and the type of glass used, dramatically impact performance. Over twenty different shapes were [/size][/size]
[size=small][size=small]evaluated before settling on the new form. Those changes, in addition to refinements in the plate structure, have led to a significant increase in performance over the previous globe style tubes. The Princess offers considerable improvements in resolution, midrange timbre and air. Distortion has been lowered with improved bandwidth linearity, resulting in a sweeter more open top end. [/size][/size]
[size=small][size=small]A whole new set of quality controls have been put into place, along with even more stringent testing, insures that the performance of each and every Princess 300B sold meets the demanding standards of Sophia Electric, insuring you receive the very highest quality product. [/size][/size]
[size=small][size=small]It’s important to note that the Mesh Plate 300B Princess tube is proprietary product of Sophia Electric and exclusively available through Sophia Electric and their select Authorized Retailers. [/size][/size]