Kt90 Upper midrage forwarness

Hello,

Running Rogue Apollo amps with EH KT90's

Im getting an Upper mid range that's out of balance and Forward.

I have had other rogue amps with Kt88's without the Forwardness.

Considering going to EH kt-88's or Gold lion Kt88's

Have High efficiency speaker which is adding to this.

hiend208-14-2022 8:55pm

decooney Details Discussions Posts This discussion Message User 1,975 posts 09-10-2022 at 11:16pm Copy Comment URL Report Comment Edit Delete @hiend2 you are not the first to report this about KT90s over the years. Agree with others here. EH new-production was a bit like that in my 6SN7 preamp and former KT88 amplifier too. Then, leapfrogged to KT120 and KT150s, and back to KT120s again for the past year in my now-current mono tube amps. IF you do decide to go with TS KT120s, no joke, give them 100hrs to settle down and settle in some. Was not a fan first 20hrs, and much more enjoyable after 100+hrs burn in. And, I will not attempt to explain why. Just is. Best of luck.
jjss49 Details Discussions Posts This discussion Message User 6,612 posts 08-15-2022 at 04:31am Copy Comment URL Report Comment Edit Delete agree eh power tubes can have a hard, glare-y sound, at least before substantial use/break in
noromance Details Discussions Posts This discussion Message User 9,769 posts 08-15-2022 at 01:36am Copy Comment URL Report Comment Edit Delete Electro-Harmonix can be a little brittle at the top. Have you given them at least 20 hours? I've not heard the 90s but I have EH KT88s with that attribute. You may do better with the Tung Sol KT120. Also consider rolling the small signal tubes.