PI trimmer and tube mismatch

[Structo]

Ouch, that hurt my head thinking about it.

I don't get it but I'll bet Bones could figure it out.


[img:445:593]http://images.starpulse.com/Photos/Prev ... ow-f19.jpg[/img]

Or this guy

[img:377:480]http://1.bp.blogspot.com/_JRXLWgXR56A/T ... d98345.jpg[/img]

[ayan]

And so could the traffic girl from one of our local channels.

[img720]http://1.bp.blogspot.com/_oxXwk8UJ7wQ/S ... drolen.jpg[/img]

She keeps me company while I have coffee before leaving for work in the morning.

Gil

[BobW]

Interesting. If an A/B test were performed using ears first, then spectrum analyzer second, it could reveal if the analyzer has any added value over the ears, of course my old ears may not hear the difference, if any.

[Structo]

Dang Gil, she is a doll. [IMG:15:30]http://i23.photobucket.com/albums/b392/ ... bc61de.gif[/img]

I won't say what our traffic gal looks like.

[talbany]

Interesting. If an A/B test were performed using ears first, then spectrum analyzer second, it could reveal if the analyzer has any added value over the ears, of course my old ears may not hear the difference, if any.

It would be a great experiment to see the differences.. The thing that I would like to know is (for those that didn't get the paper) is if the adjustment balanced or as the paper states slightly unbalanced contributed to an increase in 2nd order harmonics causing the enhanced feedback..His experiment implies that it does

Tony

[bluesfendermanblues]

you lucky guys........we only dont have any traffic gals on a guy

http://nyhederne-dyn.tv2.dk/article.php ... rafik.html

[Structo]

Sorry Tony, didn't mean to derail.

Just showing my ignorance really.

What is strange is that Hi Fi guys would experiment with even order harmonic distortion to try and make their recordings sound better.

I thought we were the only ones that did that.

[talbany]

Sorry Tony, didn't mean to derail.

Just showing my ignorance really.

What is strange is that Hi Fi guys would experiment with even order harmonic distortion to try and make their recordings sound better.

I thought we were the only ones that did that.

No Problem!! If your going to derail that's how you do it..I do think gil's girl has larger 2nd order Bloom..Don't need a scope for that.. Scope her anyway

Keep em coming!

Tony

[andyhardy]

That article kind of explains some of the "note flipping" harmonic effect
Great read

[glasman]

And so could the traffic girl from one of our local channels.

[img720]http://1.bp.blogspot.com/_oxXwk8UJ7wQ/S ... drolen.jpg[/img]

She keeps me company while I have coffee before leaving for work in the morning.

Gil

Damn, I bet she likes RACK equipment. They don't grow'm like that over here......

[heisthl]

off topic but it turns out there are several sites devoted to weather girls - for example:
http://damncoolpics.blogspot.com/2010/0 ... -ever.html
sorry for the continued Hijack.








P.S. Bet you looked

[greiswig]

Tony,

Really interesting! The article, not the weathergirl. Okay, she was interesting, too, but fer cryin' out loud...just when I'm getting some of the theoretical stuff that I was after...

I'd really like to get some software and a good set of probes so I can do some frequency analysis like they did in that article.

[glasman]

Check this software out.

It works very well (designed for speaker design and analysis) the interface box could be modified pretty easily to make decent real-time measurements.

I have used it for years to measure speaker TS parameters, but if you think outside the box, it has a lot of other potential uses.

http://www.audua.com/

[greiswig]

So if I'm understanding the article right, there is a point (roughly 1db difference between the two outputs) at which the second harmonic is at it's relative highest point as compared to the third. And that is sort of an ideal for being "harmonically rich."

I guess I'm wondering if this point is what folks end up tuning for by ear, whereas the point at which Gary shoots using a spectrum analyzer actually looks for the minimum second harmonic amplitude.

A related article also notes that in "an exactly balanced drive," the "third harmonic was higher than the second." Simply going off of balance by .2db dropped the third below the second by a fair amount.

[talbany]

So if I'm understanding the article right, there is a point (roughly 1db difference between the two outputs) at which the second harmonic is at it's relative highest point as compared to the third. And that is sort of an ideal for being "harmonically rich."

I guess I'm wondering if this point is what folks end up tuning for by ear, whereas the point at which Gary shoots using a spectrum analyzer actually looks for the minimum second harmonic amplitude.

EXACTLY THE POINT!! Give that man a Cigar!!

I am thinking the point which you and I hear the the low end appear or put another way fuller tighter like you described in that 1db spot where the 2nd order harmonics become audible as described in the Harmonics section of the paper..This may be a contributing factor in the feedback bloom whatever begins to appear..This would be difficult to confirm but makes for some sound logic..IMO

Musically the second is an octave above the fundamental and is almost inaudible; yet it adds body to the sound, making it fuller. The third is termed a quint or musical twelfth. It produces a sound many musicians refer to as "blanketed." Instead of making the tone fuller, a strong third actually makes the tone seem softer.

Tony