Build Your Own Clone Message Board

has anybody played around with the idea of completely removing the tone section of the 808 circuit (incl. the .22 tant cap, the 220 ohm resisitor and the tone pot)? i've been messing around with the variable tone shaper mod from the boardless fuzz thread with the .047 cap in the clipping stage and i am digging on how interactive that can be with the drive knob. so since this is now controlling the treble/bass response, i'd like to (maybe) get rid of the tone circuit altogether. is this possible, and if so, how so? it seems a little more complicated than just omitting some parts. thanks...

d

Someone's done it, and removed the input and output buffers too. A very stripped down tube screamer. I'll need to look for the info.

thanks. i've seen all of those Son of Screamer schems and all that, and that is sort of what i'm going for. but i'm more interested in doing this on a BYOC kit that a buddy of mine ordered last summer ('05) and just never put it together. so in essence, i need to know how to bypass that part of the BYOC board if it's possible, because it seems by reading Keen's Technology of the Tube Screamer that there is some impedance matching and other things going on that part of the circuit (not just tone shaping), and i'm just wondering if all hell will break loose if we just jumper past it on the board. i could always just use a fixed resisitor value there, but for simplicty's sake i'd like to just be rid of it.

d

Youre in luck: If you just skip wiring the pot, you will have bypassed the tone section.


K

with, otherwise, no ill effects? word...'preesh.

d

None at all. The second opamp stage will just be left as a plain buffer with a very slight gain.

Note that there's a simple static lowpass filter before this, made up of a 1k resistor & a .22uF cap to ground - but you should just leave this as is, since its purpose is to remove any harsh high frequence artifacts from the gain stage.

K

cool, that's the part i was most concerned about, what exactly *needs* to stay and what can go. many thanks...

d

If you decide to do this permanently, there's also two other components you can just leave off the board and use elsewhere: The .22uf tant cap in the middle of the board, and the 220 ohm resistor next to it.

(The pot acts as a connector beweeen the inputs of the opamp stage on lug 1 & 3, and the tone shaping components connected from viper to ground. Removing the pot breaks the connection between the inputs, and leaves the tone shaping components unconnected.)

K

d

Not sure if I can just chime in here with my questions on the Tone mod on the BYOD Classic Overdrive (TS-808) or should I just start a new post?
But, I was wondering if there was a way to get a happy medium on the Tone? The un-modded original (BYOC) Classic Overdrive (& all TS for that matter) have very high trebly tone & the Mod pack makes the tone extremely (IMO) low, taking out all highs altogether. Before modding I had to tune the tone almost all the way CCW & after modding I have to turn the tone all the CW. Is there a way to get a happy medium?
Thanks!

If you lost all the treble, then you did something wrong with the mod. Changing the .22uF to a .15uF in the low pass filter should actually increase the treble. And changing the .22uF to a .15uF in the active treble control doesn't add or subtract any frequencies, it just changes the frequency at which the tone control is notched. Changing the .047uF to a .22uF doesn't reduce the treble, it increases the bass.

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I definitely notice a change in tone from all the way CCW to all the way CW. But, maybe it is only increasing the bass? Maybe I'm not getting any treble? I'll check the solder joints between the two terminals. I have the Rev. 1.0 PCB which is very tight on those two locations.

Would be good if you could post photos....

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No problem to post a quick question here, but now that we're a few posts in, I'd recommend starting a new thread in this subforum.

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