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Tube Screamer Clone Gain Issues

Started by nephsuperman, October 04, 2006, 04:57:13 PM

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nephsuperman

October 04, 2006, 04:57:13 PM
This is a tube screamer clone from the exact specs from General Guitar Gadgets. 
http://www.generalguitargadgets.com/index.php?%20option=content&task=view&id=90&Itemid=118
This is my first pedal and I am very pleased that it works, there are some things that i see are very beginner, but we learn for our mistakes.  There is no humming or other undesirable noises and that is great.  However I am a little unpleased with the gain on the pedal.  There is not much gain and I would like to increase the amount that is possible when adjusting the gain pot.  I have seen mods for this on other sites but they were not using the same board layout as GGG.  I am looking for suggestions for changes to certain resistors/caps to up the gain on this puppy. Thanks in advance.  i will try to post a better pic soon of the board.

4 successful builds, 2 on the way.  Still trying to learn as much as I can.
GGG tube screamer *2, GGG ross compressor, and the GGG Crybaby replacement circuit.

zpyder

#1
October 04, 2006, 06:15:56 PM
I started this thread just days ago asking the same question, and expanding it to any distortion circuit "in general":

http://www.diystompboxes.com/smfforum/index.php?topic=50019.0

Check it out...

cheers!
zpyder
www.mattrabe.com/ultraterrestrial Ultraterrestrial - Just doing our little part to make new rock go where it should have gone in the late-90's, instead of the bullshit you hear on the radio today.

nephsuperman

#2
October 04, 2006, 06:33:25 PM
Here is the closeup of my circuit.
4 successful builds, 2 on the way.  Still trying to learn as much as I can.
GGG tube screamer *2, GGG ross compressor, and the GGG Crybaby replacement circuit.

nephsuperman

#3
October 04, 2006, 06:38:59 PM
Thanks!
4 successful builds, 2 on the way.  Still trying to learn as much as I can.
GGG tube screamer *2, GGG ross compressor, and the GGG Crybaby replacement circuit.

dosmun

#4
October 04, 2006, 08:50:02 PM
1 Meg Drive pot.

Check out the Techonolgoy of th TS at  www.geofex.com   All the info you could ever want.

zpyder

#5
October 05, 2006, 01:49:21 PM
Quote from: dosmun on October 04, 2006, 08:50:02 PM
Check out the Techonolgoy of th TS at  www.geofex.com   All the info you could ever want.

That article is BADASS!!! I'm a newbie gobbling up info and every day feeling like I'm getting it a little more.  I read that article quite a while back and couldn't really understand it... I read it again a few days ago (having learned in the duration) and did understand it, and it opened my eyes by a good margin.  You should check it out.  Thanks R.G.!!

cheers,
zpyder
www.mattrabe.com/ultraterrestrial Ultraterrestrial - Just doing our little part to make new rock go where it should have gone in the late-90's, instead of the bullshit you hear on the radio today.

fluxus

#6
October 05, 2006, 06:06:43 PM
I assembled this week my first real pedal! REALLY FUN! I bought a TS-808 replica from generalguitarsgadgets.com very neat site and very kind guy.
I did the asym clipp mod as you and in this way is more tube like, I have even a real tube overdrive pedal and it's really true, I have to understand well what is it this damned odd thing. there are some other mods to increase the gain, it shound works on this PCB no? anyway I like this overdrive cause its quite soft clipping so I didnt pay attention around how to mod it, apart the diode mod yes.

here mine:

nephsuperman

#7
October 06, 2006, 12:06:58 PM
Looks great.  Mine is the one in the pic above.  I have the same setup on my board as yours (with the asymmetrical clipping), although I didnt buy the kit, I went and bought all the parts myself.  As the guys have said above, I am going to Change the Drive Pot from the 500K Log to a 1M Log Pot.  Secondly I am going to change R6 from 4k7 to 1.5k.

These changes as stated above by more than a few people will increase the gain and not sacrifice any soft clipping.

This is correct, right boys?

Thanks.
4 successful builds, 2 on the way.  Still trying to learn as much as I can.
GGG tube screamer *2, GGG ross compressor, and the GGG Crybaby replacement circuit.

ubersam

#8
October 06, 2006, 03:30:58 PM
Quote from: nephsuperman on October 06, 2006, 12:06:58 PMSecondly I am going to change R6 from 4k7 to 1.5k.
You will need to change C3 as well, when you change R6. Otherwise, a 1.5K R6 and a stock 0.047uf C3 will give you a highpass corner freq. of 2.2KHz, i.e. no bass. I personally prefered a 1.5K R6 and a 0.22uf C3, giving me a 482.5 Hz highpass corner freq. = more bass than original TS. You can go with a bigger cap in C3 if you want even more bass. Anything bigger than 0.47uf (or even 0.33uf) gets too bassy for my tastes.

Melanhead

#9
October 09, 2006, 06:45:23 PM
That's the values I use as well for TS mods (.22uf and 1.5k) ... It's fatter and more gainy ... For a little less grit you can try canging the clipping diodes to a 1n4001/1n34 in series for one and a 1n4001 for the other ... It's a nice combination that seems a bit smoother to my ears whan adding gain to the TS circuit.

Izzy

#10
October 09, 2006, 07:12:55 PM
hey  what is that thing called in the pic which he is using to attach pcb board to the case?? white plastic like?

I really wanna know. I was also looking for similar stuff.
Does anybody knows what is it called.?

boogietube

#11
October 09, 2006, 07:28:47 PM
Pedals Built- Morley ABC Box, Fultone A/B Box, DIY Stompboxes True Bypass box, GGG Drop in Wah, AMZ Mosfet Boost, ROG Flipster, ROG Tonemender, Tonepad Big Muff Pi.
On the bench:  Rebote 2.5,  Dr Boogie, TS808
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