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?

hifimeomy05-10-2000 5:40am

marcorin Details Discussions Posts This discussion Message User 14 posts 05-11-2000 at 07:45am Copy Comment URL Report Comment Edit Delete 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!
hifimeomy OP Details Discussions Posts This discussion Message User 7 posts 05-12-2000 at 05:25am Copy Comment URL Report Comment Edit Delete Thanks Marcorin. Did you compare the 6550 to the KT90 in a VTL amp as well?
marcorin Details Discussions Posts This discussion Message User 14 posts 05-12-2000 at 01:52pm Copy Comment URL Report Comment Edit Delete No,i haven't compared them in a VTL amp, but in Jadis 80 mono, Sonic Frontiers Power 2 and CJ.Same result! Kevin at www.upscaleaudio can tell you the best tubes with a VTL amp.He retubes all the amp and he is very honest and friendly.Contact him!Ciao.Marco from Italy....
boonetrc Details Discussions Posts This discussion Message User 30 posts 10-06-2016 at 07:12pm Copy Comment URL Report Comment Edit Delete This is a really old thread, but has anyone ran KT90s in a VTL ST 150, instead of 6550? I have KT 90 225 Deluxe monos and really loved them. Curious what the bias difference if possible would be in the ST150. Cheers.