That's just a bit on the anecdotal side of things.Once I built a SRPP gainstage with 11HM7 pentodes wired as triodes. They are stratospherically high gm tubes. High perveance too. All looked good. one of the most linear sine waves I had ever seen coming from a tube. dynamics to burn. Ran music through it; sounded like cellophane. One of the most one dimensional sounds I had ever heard.
Can you show us the measurements?
Last edited: