So my Sunn T50C's sound is getting intermittent and the "Tube Failure" light has switched to red. So, it's time to get myself a new pair of 6L6s (or other equivalents like KT77s.)
I have two questions:
What tubes are drop-in replacements for 6L6s? I don't want anything that's gonna strain the output transformer or require modding. I do have bias test points and easy access to a bias pot, and I generally know what I'm doing when replacing octal tubes. I know the following are octal: which ones fit within normal operating ranges for a 6L6?
-KT88 (pretty sure these need more voltage than a 6L6 does)
Also, what brands should I look into for a reasonably priced pair of 6L6s (as well as any others above)?