I hope Shuguang and there KT-88's have gotten better. Many years ago I purchased 18. My amps used 16, 8 per amps. I ran out of replacements in the first two weeks, oh and lets not forget those 10 amp fuses. In my system they sounded much better than the GL-KT-88 I use now. Yet, the Gold Lion's have longevity which is worth the expense. I've often wondered what the loss rate is for retailers who perform Testing and Burn-in of new tubes and how much the failures rise the prices of the goods ones.