I'm about to break down and get new tubes for my late 60's Sentrua II. It has KT88s in it, they still sound great, but a tech told me that one of them was only pulling half as hard as the other.
Anyway, my question is about tube brands. Whats good? I have heard the Chineese ones aren't. Also, I've seen KT90s listed as upgrades for the KT88.
Any comments / experiences would be appreciated