As are the Shuguang/Penta KT88SC, which are excellent tubes BTW, but no sparkle ;-)I respectfully disagree about Shuguangs lacking sparkle. In my system, they had more sparkle than did the Gold Monarchs.
Nsgarch (System | Threads | Answers)
FWIW, my Gold Monarchs were purchased by Vintage Tube Services, the best tube seller in the business, IMO, so I believe they were of high quality.
Perhaps the amp in which they were both installed was the reason.

