Brent Jessee was one of the reputable sources listed by Chat and highly recommended as a knowledgeable and hands on guy... he was on vacation, so I didn’t talk to or buy from him in this case... and I agree I might have gotten similar advice, but I’ve been on this particular quest for all of the 3-5 years I’ve run WE 300Bs and with limited and very incremental improvements from some hard to source tubes. For me it was easy enough to find/buy the recommended tubes and just try them out... I like to hear it for myself. My system’s transparency lets you know pretty much after a few familiar songs whether you’ve stepped the right or wrong direction... and I have a box full of wrongs. Now I’ve experienced a pretty convincing leap in the right direction and am done buying tubes for a bit I believe, other than backups for the current setup.
I’m not trying to cause any contention here... I’m too old to imagine letting AI make my choices, but the question was restricted to HiFi and so was my answer. I was only expanding the playing field beyond asking AI Component level questions. If this is valuable experience for you to hear about, you’re welcome... Otherwise, nothing to see here folks...
bye now.

