What is the difference between the 12AX7, 12AT7, and 12AU7 preamp tubes?

What Is The Difference Between EL84 / EL34 and 6L6 Power Tubes?Let’s take a look at the less glamorous, but still 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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