new kt 90s any good ?

Well you can be the first. I've never heard the EH KT90, but have heard they pale in comparison to the EH KT88. My favorite octal power tube of all time was the Ei KT90, but they are long out of production and difficult to obtain at reasonable prices.

Chrissain,there's a lot more difference between the M-150 and M-180 than the tubes.I doubt you will get the results you are looking for by just adding the KT-90's.Just my thoughts.

I have the Rogue Cronus Magnum which comes with the EH KT90s - I haven't heard any other KT 90s so I can't offer a comparison, but they sound fine with the NOS tubes I have in the front end.

Magnum, if the above reference is to new issue Gold Lion KT 90s please advise where you purchased these as I haven't seen them any where?

I think the above reference was to gold lion kt88s, I dont think there is a gold lion kt 90. also does anybody know what used original GEC gold lion kt88s sell for ? used but still test strong ? thanks, chris