Dean, what did you not like about treasure 300Bs? I liked them on Manley 300B SE/PP amps because they sounded clear and clean, but maybe not as rich harmonics as other top 300Bs? idk But I didn't try any other expensive ones. I tried Sophia and another european brand that came with the amps, maybe svetlana, can't remember now. Had to be cheap ones because those amps needed 4! Treasure was much better than the euro ones. But I generally like regular Shuguang tubes too. Their cheapest 12AU7 is my favorite!