killing mids in an 808 clone...

[marrstians]

what's the best way to kill some of the mid boost in the 808? probably the one with the least parts count... i tried a mod that put a 100 ohm resistor from the .22 cap to ground and it did a little but not much.. any suggestions?

[petemoore]

Alot of the TS sound is it's emphasis on the mids from what I understand.
 Runoff Groove's got a new one called Odie, 3 Jfets. Anyone try this one, it looks kool, and the sound clip has that kool schrunch [whicha,powerchord] thing I like. Sounds like there's a mids scoop in this one listening to the sound clip.

[cb]

marrstians,
I'm curious about that mod - don't think I've heard of it. I'm looking at a TS-9 schem (signal path thru the clipping & tone sections should be the same as the 808, I think) - which .22 cap is it, the one following the 1K resistor or the one tied to the 220 resistor in the tone feedback?

Anyway, you might try the ubiquitous bass boost mod. By boosting the bass just a bit, your ear perceives less mids. I really like this mod - the pedal sounds a little fuller and less like a cardboard box. It's a simple 1 cap change: replace the .047 cap in the clipping section with a larger value. A common choice is 0.1 uf, which is what I have currently and I think it's just a little too much bass - the overall sound got kind of muddy.
I'm into subtle! So I think I'll split the difference an try a .068 next time.

Keep us posted, will ya?

[marrstians]

actually i did a couple of mods first... i have that cap at .1 folowing a 4k7 resistor... changed the 51k to 22k... i like the sound a lot... it sounds a lot like the fd2 but without all the $...

it's the .22 after the 1k... i saw the mod on http://www.greene-pedals.com/ ... it didn't seem to do much... i don't know....

[amz-fx]

There are several capacitors in the circuit contributing to the overall mid-boost sound of the TS series. One easy mod is detailed in my article called the "TS Fat Mod" at http://www.muzique.com/lab/main.htm

Making the response completely flat will remove a lot of the chacteristic sound of the TS.  The 0.22uF to ground after the first opamp can be made smaller to open up the high end some.  Try 0.1uF at first and see how that sounds.

regards, Jack

[nils]

FWIW, on my TS clone I shorted out the cap following the 4k7 and replaced that 4k7 with an 8k2. I also changed the 0.22uF after the first opamp to 0.1uF, and I used a TL072.

Now the pedal has much less gain, but great bottom end, nice grit, screaming highs and I love it, works like a charm as a dirty booster, I use it much more often than my JRC4558D equipped TS10, much less honky and making a cranked tube amp sound that much more gritty. Not advisable though if you want alot of OD from the pedal as it gets very muddy at high gain settings.

[jrc4558]

try this -
gain potentiometer - 100kB
cap-res combo to ground or Vref - .22mF and 1.2k
cap to ground after 1K - 0.1mf
0.0005 cap in the feedback loop of the second opamp.
You also may want to replace the chip to LF353 of TL072, but if you do so, replace the biasing resistors to 470K or higher, up to 1M.

It may not sound like a stock tubescreamer, but it will sound nice.

[danelectro]

I think i got this thing workign exactly how i want. its a TS-9 modded like:

2 germanium diodes in series replacing the lower stock diode. other diode is stock. this gave it some good "tubey" crunch, but lowered the gain

dropped teh 4.7k R down to 2.2K and upped the .047uf cap to .069 (i used 2 Mallory 150s, a .047 and a .022 in parallel) .1uf was too much bass imo. This added jsut enough bass and added some gain

replaced teh .22uf tants w/ green poly films.. id prefer Panasonics but i dont have any..

the two resistor swaps to ts-808 spec.

and of course the JRC4558.

it sounds sweet now

[R.G.]

If you want to know where the mid boost comes from - and therefore how to reverse it - read "The Technology of the Tube Screamer" at GEO.

[swt]

This is something i have in mind. First change the tone cap and .22 for film type. Also change the 1uf np for film. Then i'll add a jfet from the first buffer, to amplify the signal just a bit, and then a low pass filter, to a mixing resistor, to the vol section. So the bass won't get muddy, because it will be clean, and you'll have the same vibe as in a ts. Just borrowing ideas from the sparkle drive, but only using bass, to gget a real nice overdrive. What do you think?