i have had poor luck w JJ EL34’s in the past in both sound quality (harsh treble and mids) as well poor reliability ... but others seem to have better experiences more recently
KT77 will give you a uniform top to bottom sonic presentation. They are very transparent. I found to be to be light in the mid and upper bass. 7581A is in the 6L6 family and has a beefier bass sound and is tonally more dense. Have fun!
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