On hand I have the Electro Harmonix, JJ’s, and the Black Treasures. I have also heard the Sophia Electric Royal Princess in my system. So this would round out a pretty fair comparison between a good bit of the currently available 300B offerings. My system currently consists of a Bottlehead Beepre, which uses 300B tubes, feeding Western Electric 300B monoblock clones which power Tannoy Yorkminster Se loudspeakers. These monos barely cut it powerwise so for times when I am listening to classical I sub in a pair of 845 monoblocks. They give me more than enough, but for this comparison I stuck with the 4 300B’s in the chain as I thought I may have different impressions depending on whether the tubes in question were in the preamp or poweramps. All listening was done on a VPI TNT with an Audioquest 7000nsx cartridge feeding a Herron phonostage. So to start with the WE replicas I put them in the Beepre taking out the Black Treasures. I figured the Black Treasures would be the most interesting comparison as they are the closest pricewise. I found the WE replicas to be a more refined tube with a slightly leaner character. I don’t mean lean as in hyper hi fi detailed which is all the rage these days, but they were not as warm as the Black Treasures. The Black Treasure can be a slightly romantic tube, sort of the stereotypical 300B sound. This can be a slight negative at times depending on system synergy. The WE felt more linear and refined while still hitting the highs and lows when they were present in the source material. They were slightly better at detangling complex passages without blurring everything together. My opinions did not change at all when I moved the tubes to the power amps. The preamp just was a little more obvious at showing a tubes character. I was also able to get the replica WE-300B quieter in the power amps with the humpots. The Black Treasure always gave more hum no matter how much I messed with the dials. To me this suggests better quality control but my sample size is obviously very small. As always in this hobby the point of diminishing returns kicks in very early so only you can decide if the WE replica is worth the extra cake over the Black Treasures. They definitely do bring something more to the table.