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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.
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Long Live Dr.Gizmo
Follow Ups:
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.
Kind regards,
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.Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Thank you very much indeed Sir.
A very stupid move I did.
Now I understand that the au7 ad ax7 are not equivalent.Kind regards,
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