VTL 6550 vs. KT90?


I own a pair of VTL 750's and was looking to replace the 24 6550 tubes. Has anyone tried the KT88 or the KT90 as compared to the 6550?
hifimeomy
You have to go for the KT90 Ei Type 3. This tube is the best 6550/KT90 on the market today with reasonable price.I have compared it with Svetlana and GE. They sound really great!They are musical with great bass. Feel free contact me for informations.....Good luck!
I own a pair of VTL225 with KT90 tubes. I talked to VTL, they recommend me to upgrade to 6550 tubes since they are more available and cheaper. They said they must change the amps to accept 6550. Does anyone know if KT90 and 6550 tubes are interchangeable? Does 6550 sound better than KT90?? Where can I get good KT90 tubes at reasonable price?
KT90 is a 6550's substitute.No problem they are interchangeable.Best KT90/6550 is KT90 Ei type 3 at reasonable price.You can buy them at www.upscaleaudio.com .Kevin Deal is really the best!