My preamp uses both 12AT7's and 12AX7's tubes. I've installed Gold Lions, and after a couple hundred hours of play, I feel that the bass is a bit boomy. Which of the aforementioned tubes would you recommend changing?
Few 100 hours is not many for preamp tubes. They may be just broken in and you are hearing them as they should be. Perhaps there is something else amiss in your set-up.
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