Problems with Svetlana KT88 and Sonic Frontiers

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.