TS-808 Mod (Yes, another one)

[BMFJules]

I was reading up on Stevie Ray Vaughan's Soldano SLO-100.  It was modified to remove the mids above 700Hz.  What this did was give him the woodsy response that he got from his Fenders and Marshall Majors.  I want to try doing this to a TS-808 circuit.
If I build this circuit: http://fuzzcentral.ssguitar.com/pcbs/TS808layout.gif, what do I change out or substitute to remove the mids above 700Hz?

[aron]

That doesn't make any sense. If you remove mids or anything above 700Hz, you get nothing. What is the exact wording that you read?

[BMFJules]

From here:
http://lightningguider.com/id1.html

[Greg_G]

Hmm.. there's a distinct lack of information there to go on.
Were all mids and higher content filtered, starting at 700 Hz.. or were they removing just a portion in that area ?
Also note that the amp was designed to be used without a Tubescreamer, so they were trying to build the TS response into the amp.
A standard TS already rolls off content above 720Hz with the 1K / .22uf Low Pass filter after the first opamp stage.

If you really want to try it, you could increase the roll off with a second LP filter... but I doubt that's the sound they were trying to achieve.

[joegagan]

my guess, srv was paraphrasing something he heard. 700hz removed probably pertained to a particular section of tone response within a tone stack. very few people still alive have access to what this quote actually means.

[BMFJules]

I think it's basically a mid cut, not a "removal" as my article describes.
On a 20-20K Hz spectrum, where would you say "midrange" begins and ends before it becomes a high frequency?
(Excuse my layman's descriptions) :-)

[BMFJules]

Oh, and how can I cut the midrange in the pedal through changing some of its parts?

[Mark Hammer]

The thing is that the pedal's sound depends on the bass rolloff.  Change the rolloff and you change the evenness of the clipping across the fretboard.

If you are fine with that, then just do what everyone else does; which is to add more bass, rather than take out mids.  It's the overall balance that is critical.  You can do that by taking away, OR by adding/restoring what was originally taken away.