When you decide to replace your preamp tubes, some basic rules need to be followed to ensure that no problems occur. Providing the preamp tube is the same model as the one it’s replacing, there’s no need to worry about whether it is biased or not.ĭespite the straightforward answer to this question, there’s more to explore surrounding preamp tubes and biasing. Unlike power tubes, it doesn’t matter whether or not preamp tubes are biased, or if they are used in matched pairs. When it comes to replacing these tubes, certain questions need to be addressed. In the same way that the choice of pickups, strings, and effects pedals affects a guitarist’s tone, preamp tubes also have a significant impact.
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