12AX7A vs 12AX7B: What’s the Difference?

The 12AX7A and 12AX7B are both types of vacuum tubes, also known as valves, that are commonly used in guitar amplifiers and other electronic equipment. Both tubes are very similar in terms of their electrical characteristics and specifications. However, there are some slight differences between them.

The 12AX7A is a standard version of the 12AX7 tube, it’s a low-noise, high-gain preamp tube with a filament voltage of 12.6V and a filament current of 150mA. The 12AX7A has a typical gain factor of 100, which means it will amplify the input signal by a factor of 100.

The 12AX7B is a special version of the 12AX7 tube, it’s a low-noise, high-gain preamp tube with a filament voltage of 12.6V and a filament current of 150mA. The 12AX7B has a typical gain factor of 200, which means it will amplify the input signal by a factor of 200.

The main difference between the two is that 12AX7B has a higher gain factor, which means it will provide more gain and distortion. This can be useful for certain types of music or playing styles that require a lot of distortion.

In summary, both 12AX7A and 12AX7B are preamp tubes, and the main difference is the gain factor. The 12AX7A has a gain factor of 100, and the 12AX7B has a gain factor of 200. The choice between the two will depend on the desired level of gain and distortion for your amplifier and playing style.

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