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Re: 12AU7 vs 12AX7 Careful!

You will probably wreck the 12AX7 in this circuit unless you adjust the cathode resistor or the grid bias resistors. The 12AU7 can take 10mA current where as a 12AX7 will withstand only 1/3 of that current. The 12AX7 sound is most likely full of the even order harmonic distortion that an underbiased tube has, which is why it will sound both pleasing and distorted.
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