Sorry Bartokfan, but Ei made the only KT-90 worth troubling with and as you well know they are no longer running. The Jim McShane modded, vintage HK Citation amp owners snarfed up the rest (check with Jim McShane Google him). The current KT-90 is supposedly really poor. My very strong suggestion is to have it checked for Mods. Many Jadis have been modded into sonic torture machines, unless you bought it new and that is well....that. Otherwise have it rewired for EL-34s and live happily ever after. I have heard the difference the after is glorious.
while waiting on a preamp for my DEFY 7/6550's
The pre will arrive in 2 weeks. So i decided to pull 4 of the 6550's in the Defy and swap out the KT90's in the JOR. Man I sure hope the Defy does not sound like the JOR with 6550's. Because if it does I'm not going to like the Defy with 6550's for my classical. Way too tubey and bloated, all the fine definition and sparkle from the KT90's was gone. I guess I'm going to need to buy ...12 Czech KT90's. Gonna cost me a bundle. Any suggestions?