Problems with Svetlana KT88 and Sonic Frontiers


I've heard that Sonic Frontiers has experienced problems with the Svetlana KT88 in their Power series of amplifiers. SF claims that it was due to a bad batch of tubes, and has switched to the Sovtek KT88. I would like to try the Svetlana KT88, but I am now reluctant to do so. Has anyone tried the SVKT88 in his or her Power series amplifier? What has been your experience? Thanks.
brf
I don't have a sonic frontiers amp, but a Copland and the Svetlana's have worked better than any other power tube I have tried including Sovtek KT88, Svetlana 6550C, JJ Tesla KT88, Tung-sol 6550, and a GE6550A. The mids were more pronounced and very silky smooth. The bottom end was the tightest of the bunch.

I would only think SF was right and it was a bad batch. The KT88 was their newest tube and there might have been some growing pains. They work well now. If you go to a few of the tube dealers web-sites, that is the tube they are using personally. I have had SF amps and they should work fine.
I owned the Power 3s about 5 months ago and was also told of to avoid Svetlanas. I went ahead and used the Sovteks and never went back, I found them to be very nice sounding in the MIDS. From what I understand, If SF runs the tubes at a very high bias, and the Svets were blowing at whatever the biasing point is. I did try the Ei90s, the Newest Chinese kt88s (the name escapes me now) and the Sovteks just did everything about right
I'm using the Sovtek KT-88s in my Music Reference RM-9 amp with great results. It beats generic Chinese 6550s and EL-34s by a mile. I've had them for five months with no problems. The Svetlana's have a great reputation in the high end and I'd like to try them. I hope this is just a single isolated bad batch.