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hardcore misery
Copper Member
Philippines
32 Posts |
 Posted - 04/21/2007 : 13:26:02
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i have TL072 now... is there any opamps better than this?
>lower noise
>greater gain |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/21/2007 : 17:41:53
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Hi hardcore misery, ChristoMephisto & Guys
ChristoMephisto, I was just about to post a note to that link,
But you seemed to have beat me to it (again), Youth verses age. 
Pls. check you PM ChristoMephisto
You are right about the many flavors of Op Amps to use, it does become
very much subjective, & highly influenced by the listens personal choice, of what he expects, Overdrive-=Distortion to sound like.
I know myself, the Od Dist. that I liked yesterday, might not, sound so good today, or now.
Regards Dr. Bob 
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hardcore misery
Copper Member
Philippines
32 Posts |
Posted - 04/22/2007 : 06:37:26
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any high-gain pedal users here?
SD-1 is not a high gain pedal right? |
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pawnshop_trash
Gold Member
USA
603 Posts |
Posted - 05/01/2007 : 20:37:34
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the SD-1 is not high gain, but has just one op amp chip. higher gain pedals such as the DOD Grunge use four three 4558-type op amps (probably in series?), but the noise is amplified as well. however, perhaps cascading a few RC4558P chips would give you what you want. I'm not sure what the best low-noise, high-gain, and musical-sounding chip is, but it might be worth installing a socket in a pedal to try different types. |
Edited by - pawnshop_trash on 05/03/2007 16:10:00 |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 05/02/2007 : 02:56:49
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Did a quick scan of most of the boss od/dist pedals, and of those that did use a dual op amp, it was either a 4558 or your TL072.
As long as the pin outs are the same, you should be able to swap out the chips. The RC4558DD is double shielded compared to the 4558D version, meaning lower noise, so says the manufacture.
What pedal is this for? The only one I could find had the 4558 chip or a single inline IC. |
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hardcore misery
Copper Member
Philippines
32 Posts |
Posted - 05/06/2007 : 13:57:21
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quote:
Did a quick scan of most of the boss od/dist pedals, and of those that did use a dual op amp, it was either a 4558 or your TL072.
As long as the pin outs are the same, you should be able to swap out the chips. The RC4558DD is double shielded compared to the 4558D version, meaning lower noise, so says the manufacture.
What pedal is this for? The only one I could find had the 4558 chip or a single inline IC.
this is for a metalzone clone..
i also have metalzone... and it is more powerfull than the mt2 clone(i'm using tl072) so i'm finding an OPamp which can surpass MT2...
the mt2 clone uses polyester film caps(while mt2 uses silver mica caps) |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 05/06/2007 : 16:18:45
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quote:
Originally posted by hardcore misery
quote:
Did a quick scan of most of the boss od/dist pedals, and of those that did use a dual op amp, it was either a 4558 or your TL072.
As long as the pin outs are the same, you should be able to swap out the chips. The RC4558DD is double shielded compared to the 4558D version, meaning lower noise, so says the manufacture.
What pedal is this for? The only one I could find had the 4558 chip or a single inline IC.
this is for a metalzone clone..
i also have metalzone... and it is more powerfull than the mt2 clone(i'm using tl072) so i'm finding an OPamp which can surpass MT2...
the mt2 clone uses polyester film caps(while mt2 uses silver mica caps)
I see, IC, said the blind man, that makes more sense
The pic of the mt2 had four single line ICs, the specs say 2M521BAL, and think i saw somewhere a sub was a TL072P...
Did a search on op amps and the tl072 is considered a good all round op amp for low noise uses. Even the ge7 mod suggests swapping out to tl072 or ne5532 to reduce noise.
Replace the ic in the clone to a ic socket and try out a bunch of differnt ones. the rc4558p is cleaner than teh 4558dd
just make sure teh pin outs are the same.
To get lower noise replace electro caps with nonpolarity caps of the same value. To get more gain, that involves a bit more than swapping an ic. Ususally resisitor and cap changes by lowerin teh res but keeping the same frequncey, or lowering it for more bass. Without specs to your clone at the input/drive section, or output like on the T9 mods cant tell you what to change where. Im more familiar with the sd1 pedal, which is close to the T9 pedal also.
let me know, and good luck |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/06/2007 : 16:35:57
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Hi Christo
Did you manage to do any mods to your SD-1?
I resent the text clippings, as raw text to your PM.
On the issue of higher gain, why not try driving the pedal with a booster, or another dirt pedal with the Distortion-overdrive knob set to off or low.
This topic has been discussed in another thread,
OR
What about building the equivalent of the LPB-1 --- a 1 transistor booster, & fitting it into the pedal that your modding.
Experiment with it, wired t the output, & the input.
It seems that one one has even gone this route, with gain mods, to their pedals.
I would probably use a FET like the J201, else a Low noise med-High gain transistor.
Built on a small bit of Vero or PCB - like the FET buffer mods for the Crybaby.
Or fitting it, somewhere in middle of the signal chain, of your pedal.
Sorry If I hijacked the thread.
Regards Dr. Bob 
I think I have to get my soldering iron out.......... |
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hardcore misery
Copper Member
Philippines
32 Posts |
Posted - 05/09/2007 : 13:28:01
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do you have the schematic for this FET booster?
i'll post some pics soon, for me to explain my questions here... |
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hardcore misery
Copper Member
Philippines
32 Posts |
Posted - 05/09/2007 : 14:07:24
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| how does the slew rate of opamps affects the tone? is it a factor for volume? the higher the slew rate, the higher the clean headroom? |
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DarrinPA
Silver Member
USA
221 Posts |
Posted - 05/10/2007 : 05:57:23
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| I used to be all about the gain. What I did was use a metal pedal and also a Boss Bass Distortion [ODB-3] as extra gain. Because the ODB-3 can be set to mix distortion and clean gain it kept my signal clear sounding but with a ton of gain. I'm just saying this because I have know knowledge of the pedal circuits. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/10/2007 : 07:05:50
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quote:
Originally posted by hardcore misery
do you have the schematic for this FET booster?
i'll post some pics soon, for me to explain my questions here...
Hi hardcore misery
There are quite a ew posted around the web if you look.
there's even one, that some guy built into the actual shell, of a guitar jack.
I can't remember the link, but it wasn't hard to find.
Do search for: fet buffer - fet preamp - fet booster.
Regards Dr. Bob |
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nilo
Bronze Member
Sweden
75 Posts |
Posted - 08/29/2007 : 10:38:58
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for a more tubelike sound, try teh OPA2604AP
or if you like the ADA mp-1 dist characteristics, try NE5532, these should both fit in size and work perfectly... |
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Topic |
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Recomended OPAMP for high gain pedals
