Harmonic Frequency of 12AX7

[ba3jar]

Hi everyone

i'm looking for a way to calculate the range of harmonic frequency in a 12ax7 tube without being distorted , a clean harmonic frequency rather than harmonic distortion does anyone have any idea or have a schematic to show that ?

thanx

[Jazz P Bass]

Got Spice?
I am not into spice at all, but this guy is.
Check it out.
spiced 12AX7 - quitte
And here is a link to a spectrum analyzer setup.
http://www.kjlamps.com/techArticles/Harmonics1.pdf

[tubeswell]

Calculating harmonic distortion is covered at about pages 4-6 in Ch 1 of Merlin Blencowe's 1st book: Read the first chapter for free here.

Basically you need to calculate the difference in voltage gain on either side of the bias point using the load line. For every 1V of voltage swing at the grid either way, you will get a corresponding gain at the plate, but the gain at the plate will be lower for the negative-voltage-part of the grid signal swing than it will be for the positive-voltage-part of the grid signal swing. The proportion of this difference represents the extent of harmonic distortion present

[km6xz]

What are you really wanting to know? Your question does not use the terms, as expressed, in how you intended to ask.
Harmonic range without distortion? Hard to tell what you wanted but that does not make sense. If you are asking what harmonics present at the grid will be amplified and appear at the load, the tube itself...although the tubes labeled "12AX7" are all over the map in actual specs, should be usable to the 20th harmonic of A.
If you are asking about harmonics generated by the tube without distortion, that is easy; 0. Any harmonics generated by the circuit ARE distortion.
Maybe if you describe what you are looking for a better answer would be possible.

[diagrammatiks]

all the frequencies it can before saturation or cutoff.

the range is dependent on the circuit. not the tube.

[J M Fahey]

Agree. The question, taken literally, makes no sense.
If we answer what we think he asked, itīs just a wild guess, impossible to verify.
Dear OP, please explain what you want to know.