new tube break in

hi guys,
what is the usual break in period for new tubes for a amp?i have quicksilver v 4`s and i am looking for new kt 88`s
thanks
al

alpass12-21-2005 1:52pm

rhljazz Details Discussions Posts This discussion Message User 1,255 posts 12-22-2005 at 08:36pm Copy Comment URL Report Comment Edit Delete I'm pretty much in agreement with Fatparrot on this one. The biggest change will be in the first 25 hrs. After that they will settle in slowly. I have the Shuguang KT88 in my VAC PA100 and compared to the Svetlana's they are more mellow, more upper bass and midrange bloom and not quite as solid in the bass.
alpass OP Details Discussions Posts This discussion Message User 174 posts 12-22-2005 at 09:21pm Copy Comment URL Report Comment Edit Delete are they from penta
jburidan Details Discussions Posts This discussion Message User 803 posts 01-10-2006 at 02:56am Copy Comment URL Report Comment Edit Delete I like the Penta Lab KT88SC's. The bass is good and tight. They reveal lots of detail and nuance without ever being harsh or bright. Probably original Tung Sol 6550's are better, but the cost is out of sight. The Penta Lab KT88SC's are my favorite new production KT88 or 6550. I even like them better than NOS Philips ECG 6550. Maybe the Ei KT90's are better, but only type I or II. I won't go near the type III's after several bad experiences. Hope this helps. Jay