Wow! Thanks for such detailed and valuable input given my nil experience with tube rolling. I think my first strategy is to replace the two 6SL7s and see what improvements I’ll get. Then down the road I can switch to EL34s. Looking at Tungsols, which are getting great reviews.

Fantastic tips. Thanks so much.

Thanks for the useful info. If I were to replace the preamp tubes, what would you suggest? And what sort of improvements should I expect? Is there a chance that the harsh highs could be lessened by changing the preamp tubes? Sorry for all the questions. Really a newbie here.