BOSS GE-7 RIP-OFF

A forum devoted to mod, tips and suggestions for upgrading and rehousing your VERY CHEAP commercial stompbox to near boutique excellence.
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yahoo!
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Post by yahoo! »

Hi to all! i have a beta-aiven (boss ge-7 copy) give me some tips to change the frequency of each sliders??

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Silent Fly
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Post by Silent Fly »

Changing the frequencies of GE7 is not a major problem but it looks like this pedal is not a 100% clone of the GE7. The GE7 uses 5 transistors, this pedal uses 4. Moreover, it looks like the component names are different and the ICs are not the same...
"Remember - all I am offering is the truth, nothing more". Morpheus

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ChristoMephisto
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Post by ChristoMephisto »

If you have the schems so you know where what is, you can change the frequency with a EQ calculator.
There's one here at http://www.geocities.jp/dgb_studio/index_e.htm under Electronic Circuits
For example, if you swap the C13 in the MIJ GE-7 from .056 to .047 will shift it from 100Hz to 125Hz

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devastator
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Post by devastator »

You can find the same calculator type here :

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

It's me or this clone has better caps than the silver cap of Boss ?

(but why do you want to change the frequencies ,?)

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yahoo!
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Post by yahoo! »

devastator wrote:You can find the same calculator type here :

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

It's me or this clone has better caps than the silver cap of Boss ?

(but why do you want to change the frequencies ,?)
i want to fatten more my sound. :D

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devastator
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Post by devastator »

I don't think changing EQ values will fatten your sound. you'll just change de the frequency. I think Boss aera advices to use GE7B (Bass version) and GE7 to have a really full control. I think you're no needs to change the frequency on this EQ expect if you want to create a personnal EQ (with your own bands) or to stick it with a particular instrument.

Few month ago I used my Ge7 to fatten my sound, I boosted the frequencies around 400Hz (400Hz was the highest band). That create a bigger sound, with more "fat". That worked good for me.

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Post by BAMF »

I just got one of those. The only real mod I can think of right now is to change those 4560's with TL072's and I did just that. It made the equalizer much much more open and "sparkly". Try it. :-D

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roseblood11
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Post by roseblood11 »

https://www.diystompboxes.com/smfforum/ ... ic=75200.0

This is what I did:

-replace the three JRC022D with RC4559P
(OPA 2134, OPA2132 or OPA2604 should work as well and maybe even sound better, but the 4559 is a good and cheap choice here - don´t use the ne5532 here, because it has a very different input stage -
it´s most important to replace the NJM2068 with a high quality, low noise chip, see below...)

-replace capacitors:
C18,C25, C29, C30 : 0.047 µF
C21, C22, C32 : 1 µF
C13 : 0.1 µF
(use stacked metal film caps (MKT) for all positions!!! Panasonic ECQ-V series sounds very good here)

-Replace NJM2068 at position IC3 with a OPA2134 or 2132 (use a DIP-SIL-Adapter or built an adapter using perfboard). (Look at the photo below)
DIP-SIL-adapter: http://www.musikding.de/product_info.ph ... --SIL.html (you can buy them from Monte Allums, I guess)


These mods only work with the new version of the GE-7, which looks like this:
http://www.monteallums.com/images/GE7_New.jpg

My pedal with diy DIP-SIL adapter:
Image

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yahoo!
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Post by yahoo! »

roseblood11 wrote:https://www.diystompboxes.com/smfforum/ ... ic=75200.0

This is what I did:

-replace the three JRC022D with RC4559P
(OPA 2134, OPA2132 or OPA2604 should work as well and maybe even sound better, but the 4559 is a good and cheap choice here - don´t use the ne5532 here, because it has a very different input stage -
it´s most important to replace the NJM2068 with a high quality, low noise chip, see below...)

-replace capacitors:
C18,C25, C29, C30 : 0.047 µF
C21, C22, C32 : 1 µF
C13 : 0.1 µF
(use stacked metal film caps (MKT) for all positions!!! Panasonic ECQ-V series sounds very good here)

-Replace NJM2068 at position IC3 with a OPA2134 or 2132 (use a DIP-SIL-Adapter or built an adapter using perfboard). (Look at the photo below)
DIP-SIL-adapter: http://www.musikding.de/product_info.ph ... --SIL.html (you can buy them from Monte Allums, I guess)


These mods only work with the new version of the GE-7, which looks like this:
http://www.monteallums.com/images/GE7_New.jpg

My pedal with diy DIP-SIL adapter:
Image
thanks!! :thumbsup

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Arnold21
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Post by Arnold21 »

Thanks for taking time to help

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roseblood11
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Post by roseblood11 »

Image

This is what I did. (I had deleted the photo on my flickr account...)

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ntuncer
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Post by ntuncer »

Hello, question about changing the frequency of 6.4K. According to the schematic the other frequencies could be calculated as bandpass EQ but I couldn't understand 6.4k as there is no IC for it. Could you please explain how to achieve to 4K instead of 6.4k with the logic?

Schematic link:
https://www.dropbox.com/s/pdj7xefxvsp8lpw/ge-7.JPG?dl=0

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OC26
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Post by OC26 »

VR7 works as a simple treble cut / treble lift as in Tube Screamer. It's a simple RC network (fo = 1/2piRC) IMHO

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