[maro]

Originally Posted by nhparrot

I have done a lot of tube rolling in my 2015 Inspire 6L6 Fire Bottle amp (various 6L6, 6V6/5992, KT88, KT77, EL84 and 6F6 power tubes). Different combinations have different nuances to the sound signature. In my amp with my speakers, I'm my room, to my ears the 6V6/5992 and 6F6 give me the most pleasurable listening experience.

Did you listen to the new production Tung-Sol 7581a tube? It seems to get good reviews on some sites.