I've bought a set of NOS JAN Philips 5751 tubes to replace JJ 12AX7 in my preamp. After the change, the sound has become worse. The soundstage depth is flat, and just less involving overall. Do the tubes need break in, and if so how long do I need to burn them in?
This has been discussed here before. Type in nos tubes in the "search archives" section of this forum and you will see a posted question from 2008 about this same subject.
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