I just bought an awesome little 6V6 SE amp from a Canadian company called Musical Paradise, its called an MP301 and it only costs $200!! Dead quiet and ballsy, I was shocked! Point being, this amp is their bottom-of-the-range, and their $800 top model uses these GuiGuang 300B's. They sell them separately...for $100 a matched pair, brand new! Maybe someone bought them from there, didn't like them, and flipped them on e-Pay to you? If Musical Paradise sells them, then I assume that they are bottom-feeder grade bottles just like the rest of what they use to keep their amazing prices so...well, amazing! Years ago I auditioned several types of 300B as a driver stage in the top-of-the-range $20k Cary 845 PP amps, and the Shuguang's were just horrible, even worse sounding than the JJ's or Sovteks...which in turn were absolutely DISGUSTING compared to the Cetron (US Made) and Western Electric re-issues. Only with the latter 2 types did this amp sing, all the post-communist stuff made the amp sound like something from Sonic Frontiers! If you really want great sonic results from a Chinese triode, I'd go for the original carbon-anode Shuguang 845's. Apparently, the factory has just ceased production, so get them whilst you still can! It figures that they'd discontinue the only half-decent sounding valve they made...