Expanding the TS-9 Tone Control

[amz-fx]

New article that I posted today....

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

Enjoy!

regards, Jack

[96ecss]

Great article as always.

Thanks Jack.

Dave

[Mark Hammer]

1) Thank you.  I have grown weary of typing out explanations of that control, and those initial two ictures saved me several thousand words.

2) VERY clever ideas with respect to just changing the location of a few nodes.  Some nice out-of-the-box thinking on your part.  Hard to do when the circuit in question is a classic and people can't imagine it any other way.

3) It had never occurred to me until seeing it redrawn this way, how close a relative the TS tone control was of the SWTC.

4) The Maxon precursors to the TS-808 included an OD-805 (num?) that reversed the order of the tone and gain stages, such that the tone control preceded the gain/clipping stage.  Seeing these circuit suggestions, and particularly considering their more powerful tone-shaping possibilities, kind of makes you wonder whether there is still some life in the earlier version of the basic circuit, or perhaps some sort of perverse combination of pre-clip tone stage plus post-clip tone stage.  Who knows, maybe this is a solution to the mid-hump/bass-thinning problem that so many have tried to ameliorate.

[beatstrat]

Good stuff - thanks, Jack; your Lab Notebook continues to grow in wealth, girth - and value.

[MetalGod]

Interesting reading as always - I'll have to try those out.

[vanhansen]

Great read.  I never tire of your articles, Jack.  They've helped me out more than once in my adventures.  Thanks for sharing all that you do.

[Kornell]

Thanks Jack! 

[slacker]

Interesting stuff. I reckon you could build a killer pedal based just on the stuff in the AMZ labs.

[amz-fx]

I just updated the article with a couple of other configurations, including one interesting two-band one-knob control 

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

regards, Jack

[YouAre]

I liked the wah inductor idea! Is there any component to change to shift the frequency of the mids dip/spike? What would be the equation to achieve the desired frequency?

thanks,
murad

[MartyMart]

Great stuff Jack - as usual !! 
Marty.

[amz-fx]

I liked the wah inductor idea! Is there any component to change to shift the frequency of the mids dip/spike? What would be the equation to achieve the desired frequency?

The info you want is now in the article.

-Jack

[wampcat1]

jack - great stuff - sending you a PM about something...
bw

[YouAre]

The info you want is now in the article.

-Jack

Thanks! I believe you said in one of your articles about the TS that the corner frequency of the TS mid hump is about 750hz (if it wasn't your article, I apologize). Would you say that's about right?

Also, I calculated what it would take to get about 750hz. A .9uf cap (a 1uf and .1uf cap in series works) would get about 740-750hz (depends on tolerance of cap and wah inductor!) for anyone that's interested.

[amz-fx]

A .9uf cap (a 1uf and .1uf cap in series works) would get about 740-750hz (depends on tolerance of cap and wah inductor!) for anyone that's interested.

A 1uf and 0.1uF in series will be about 0.09uF

Series capacitance = (C1*C2)/(C1+C2)  = 0.1uF/1.1uF = 0.09uF   

regards, Jack

[YouAre]

A .9uf cap (a 1uf and .1uf cap in series works) would get about 740-750hz (depends on tolerance of cap and wah inductor!) for anyone that's interested.

A 1uf and 0.1uF in series will be about 0.09uF

Series capacitance = (C1*C2)/(C1+C2)  = 0.1uF/1.1uF = 0.09uF   

regards, Jack

i made a typo in there somewhere....i'll fix it later. haha sorry

[YouAre]

My Apologies, I knew it was a .09 uf cap, i just made a typo with .9 by mistake.

But a .09uf cap will yield the 750 hz according to that equation.


Still, is that close to the right frequency of the screamer's nasally middy character?

[amz-fx]

You are probably thinking about this article:

http://www.geofex.com/Article_Folders/TStech/tsxtech.htm

regards, Jack

[YouAre]

You are probably thinking about this article:

http://www.geofex.com/Article_Folders/TStech/tsxtech.htm

regards, Jack

ah yes! my apologies for mixing them up. But would you say 750hz is a good frequency to go for?

[YouAre]

sorry to bump an old thread but..


i tried to implement the inductor tone control with MarkM's od808 layout (the tone control layout as described in the original article was the same as on the maxon). I don't think i get as pronounced of a midrange boost or cut as i would like with the new control. I used a .09 uf cap. How pronounced should the cut/boost be?

come to think of it....i might have used the 20k G taper pot that smallbear sells. Should i use a 25k linear pot instead?

Also, is it possible to add another pot so that i have the stock tone control as well? Ideally, i'd like the tone control and the mid cut/boost knob.

regards,
murad