Great replacement for KT88
I am using Yaqin MC-100B which come with KT88. The stock amp is powerful but the bass is loose and a bit sharp on the top. The staging also almost flat. Initially I thought it was because my ears are get used to 300B sounds. One day, I have a change to replace the KT88 with this EH KT90. After setting the bias, I play my favorite music and WOW. I hear something is very new. The low end is tight and controlled. Top end also softer and smooth and the sound stage is back. I feel my speakers are disappeared. I am very satisfied with my decision to use this KT90.