What is the Difference Between the 12AX7, 12AT7, and 12AU7 Preamp Tubes?

12AX7, 12AT7, and 12AU7Let’s take a look at the less glamorous, but equally important type of amplifier tube – the preamp tube.

The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. In many cases, these tubes are interchangeable and can easily be swapped. We will take a look at why you might, or might not want to swap out the different types of tubes.

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