KT88 s Sovtek vs Valve Art

I would go with the Svetlana KT-88.I had Svetlana 6550 C in my Rogue 88.Nice tube.

Cameron Diaz prefers NOS KT-88's, but will settle for JJ KT-88 or Svetlana KT-88 or Svet 6550 ( in that order ) . Cameron wouldn't bet caught dead listening to Chinese or Sovtek tubes.

Redkiwi, the KT88s I got were my present to myself on having my son graduate from college. Had to do something with the money I'd otherwise be spending on tuition, you know! On Sovtek vs. Svetlana, I agree that the Svetlanas are the best of the 6550s currently available that I have heard, and would echo the above posters' recommendations. I do note that even they only lasted 1-1/2 years in my amps, where the MO Valve KT88s have gone almost 3 now with minimal wear. At this rate, my "lifetime" supply may last beyond that!

I find the JJ(Tesla/Teslovak) KT88 to be the best sounding of the currently produced KT88. I do not care much for 6550, preferring to instead go with KT88 if I am pursuing a sweeter tone, or Ei KT90 for a more neutral sound. One thing to be cautious about with the Czechoslovakian KT88 was that there was a period of time about two years ago where they were producing disastrous KT88. They would routinely fail within the first three months of operation. They had a difficult time maintaining consistent bias, and even sounded very, very erratic during operation. Russian tubes seem to represent a step down in sonics for me. But, if I was going to buy Russian tubes, I find Svetlana better to my ear.

I might put my JJ's back in and see if I agree. Difficult when I am in the middle of running in some cables so it will have to wait a week or so. Last time I compared them I preferred the Svetlana KT88 over the JJ, with the JJ being a little too polite. But this was a character thing not a quality thing.