Shuguang 845B Tube
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The 845B is a recent development by Shuguang, and structurally it is a very close copy of the 1940's vintage Amperex brass base 845. It has a graphite plate (like all 845s since the 1930s), and a beautiful copper base. Like the Amperex, it has no top mica connecting the plate structure to the glass envelope. These 845B's have full 845 dissipation ratings and 1250v plate rating.
The advantages of the Shuguang 845B tubes over the standard Shuguang 845 include less noise, better handling of low frequencies, a smoother, more natural sound, and greater detail.
