![]() ![]() It will "work" in most of the same circuits, but this tube prefers some circuit tweaks to optimize its performance, and usually just doesn't sound very good in V1.) ![]() (Note that the 12AU7 is not a great substitute in the preamp positions in most guitar amps, even when you really want to tamp things down. It also helped maintain high headroom in the four E元4s in the output stage. With an amplification factor of only 19, making it a lower-gain tube than any of the four we've discussed so far, the 12AU7 was extremely resistant to distortion in the PI stage. Taking things even further in this direction, when JMI wanted to create the cleanest, most powerful guitar amp imaginable in the early '60s-specifically to help the Beatles be heard over hordes of screaming fans in larger and larger venues-they used a 12AU7 in the 100-watt AC100. The goal was to give the Beatles enough clean power to be heard over thousands of screaming fans. The 12AU7 is extremely resistant to distortion in the PI stage, which is why, circa 1963, JMI included a 12AU7 in their new 100-watt Vox AC100. An intriguing alternative for the phase-inverter tube, the 12AU7-aka ECC82 in the U.K. ![]()
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