One other point. Never even consider rolling tubes until your new Zesto gear breaks in. That means at least 600 hours of play. I wouldn't try different tubes, if that is your intention, until the 1000 hour mark.
I was not considering tube rolling for awhile... just "new' owner excitation and curious about all things Zesto, there is very very very little information about these preamps, especially the Leto, out there.
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