TS flat response mod

[arfy]

I’m doing a Tubescreamer project using the board you can buy from Build Your Own Clone.  I want to include a mod I’ve seen online but I can’t recall the site to look it up again.  The idea is you add a resistor of about 500k across the feedback loop that has the back to back pair of diodes and the 47 pf cap, and that somehow enables a full(er) frequency response when the gain is turned down.  And the TS mid-hump is introduced gradually as you turn up the gain.  Best of both worlds, or at least that’s the intention.  And it would be great to use the pedal as a clean boost as well as the usual TS thing.
I have sockets in the circuit for the diodes so I soldered a 470k resistor across a diode and can insert that to try it.
So my questions are:
   Does anyone know the name of that site I found the article?  It had some graphs of frequency response curves, and I’d swear it was from England.
   I used a 1k and a .22uf in place of the 4.7k and, what is it, I think .047uf, to set the gain higher.  Does anyone understand this well enough to say if I should change the value of the 500k across the diode because these are changed from the stock values?
…just when I think I’m free, that damn tube screamer thing sucks me back in…

[bioroids]

I dont know what's the site you say, but plenty of info can be found at http://www.geofex.com/Article_Folders/TStech/tsxfram.htm The Technology of Tube Screamers

Hope this helps

Miguel

[SteveB]

Maybe it's this site? http://www.kilback.net/homebrewtweaks/pedals/pedals.htm#SKILDRIVE

He says this about the 500k resistor.
"Headroom - inserts a 500K in series with the feedback loop diodes which raises the clipping threshold and effectively cleans up the signal. Great for clean boosting. I'd love to use a 500K pot here which would add even more flexibility. John Greene gave me this idea"

I'm not sure if that's what you want, but that's what I thoght of when I read your post.

He has a link to John Greene's page, which has a tech page with frequency plots.

Hope this helps,
Steve

[arfy]

Here's a link to the article I was referring to:
http://www.geocities.com/SunsetStrip/Studio/2987/fatts.html
according to this I should use a 560K across the diodes.
Anyone tried this to confirm the result?
It seems to do what they say in the clip.

[mojotron]

The way the flat-mids mod is done on the later fulldrives is to put a .01uF cap and 47k resistor in series running from the final output pin of the 2nd stage of the opamp to the wiper connection on the gain pot.

This mod is not in the Tech of the Tube Screemer paper.    

This mod is not quite the same thing as what your link describes, but matches the mod you described.

[amz-fx]

Here is my "Fat mod" for the screamer which gives more bottom end:

http://www.muzique.com/lab/fatt.htm

regards, Jack