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In Reply to: 12AU7 as a buffer - suggestion of brand/model. posted by beppe61 on February 13, 2007 at 23:42:41:
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.
Long Live Dr.Gizmo
Please excuse me Sir, are you saying that I am stressing the ecc83 and eventually I will destroy it ?
I am a little worried because is a quality tube I understand.
A real NOS Telefunken ....
Please could you elaborate ?
In the meanwhile I stop using it.
Thank you very much indeed.
If the circuit (Supply voltage, cathode resistor, etc...) is designed for a 12au7, a 12ax7 will have to much current flowing through it. To use a 12ax7 in that circuit, the circuit needs to be redesigned first.
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