Thank you to all those who read, understood and responded to my simple question and to all those who chose to answer a completely different question ie do tubes need to be burnt in? With regard to that latter issue, as it has been raised, I might as well add my 2 cents worth. If Brent Jesse, a guy who has extensive experience with almost all types and brands of tubes, says they need burn in then in my view they need burn in. If anyone on this site claims they have more experience than Brent Jesse please raise your hand. Also why would all reviewers of the Shuguang tube, who generally responded favourably, make a point that they need an extremely long burn in time? In my experience over many years (too many years ) I have found that some tubes need about 10 hours burn in and others much longer. I have never encountered a tube that needs 200 hours so when I start to use the Black Treasures I guess I will find out.
Simple question, probably stupid
Is it necessary to have sound (music or white noise) playing through the speakers when burning in new tubes? I have bought a matched quad of Shuguang KT88 Z Black Treasure tubes to compare with my current Gold Lion KT88 and Tung-Sol KT120 tubes in a Rogue Stereo 90 amp. Reviews of the Shuguang tubes indicate that they need around 200 hours of burn in to reach their true potential but I am not looking forward to having to listen to 200 hours of crap sound.