Which tubes do I change??

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?

markj94102-10-2018 4:58pm

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roberjerman Details Discussions Posts This discussion Message User 4,319 posts 02-10-2018 at 05:24pm Copy Comment URL Report Comment Edit Delete What preamp do you have? And your source - analog or digital?
markj941 OP Details Discussions Posts This discussion Message User 53 posts 02-10-2018 at 05:27pm Copy Comment URL Report Comment Edit Delete Jolida fusion pre. Digital source.
czarivey Details Discussions Posts This discussion Message User 5,946 posts 02-10-2018 at 05:45pm Copy Comment URL Report Comment Edit Delete X tube has highest gain among 12A'7s so more vulnerable to hear differences in any tube preamp.
tomcy6 Details Discussions Posts This discussion Message User 2,597 posts 02-10-2018 at 08:00pm Copy Comment URL Report Comment Edit Delete It depends on the function of the tubes. The input or voltage gain tube is going to affect the sound more. I’d guess that is the 12AX7. The 12AT7 is probably a cathode follower (or something like that, someone correct me if I’m wrong). I am assuming that you have the other tubes that you replaced with the Gold Lions. Put both pairs of your old tubes in and listen for a while to get a good handle on the sound. Then, first change the 12AX7 to the Gold Lion, see if that causes the bass problem, then do the same with the 12AT7. It may turn out that the Gold Lions in one position and the old tubes in the other, or some other combination, works best. There are a number of threads on the Jolida Fusion here. Do a search and you’ll find lots of info.

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