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eeone
Bronze Member
Yugoslavia
121 Posts |
 Posted - 03/03/2006 : 13:10:18
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First post in a while... Well...
I got an MIJ GE-7 yesterday. I bought it cause I was in a need of an equalizer. I haven't tried GE-7 before, but I've played my friend's GEB-7 on my guitar for quite some time and am extremely happy with tones I can get out of it. So I figured, if bass equalizer sounds this good, how will sound one made for guitar...
Than I came home with 60 euro less and the MIJ GE-7.
The pedal is in very good condition and that's not the problem. I'll post the pictures later.
The problem is : if any of the slider is outside the neutral (0 db) position and the guitar signal is not being distorted, the pedal itself distorts. It gets even worse if I let the notes ring. This doesn't happen when all sliders are in neutral position. Also, level slider doesn't seem to have an effect on this, except that the overall volume (of both signal AND the noise) is higher.
And that noise is present even if some of the sliders are set to cut frequencies...
If placed after distortion (well, I always place eq after distortion, in this situation dist is ON) , noise cannot be heard and ge-7 does it's job quite well.
I checked the cables, checked the amp and the guitar and they're all
okay. GEB-7 doesn't do this so I am pretty sure that it's the pedal itself.
There...
As I mentioned, I'll try to post some pictures and sound samples of what I'm talking about.
Sorry for being theatrical, I feel SO down about this... 
[EDIT] : typos... |
Edited by - eeone on 03/03/2006 13:12:17 |
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phostenix
Gold Member
USA
754 Posts |
Posted - 03/03/2006 : 18:30:53
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| Have you tried it with different power supplies or even a fresh battery to see if you get the same result? |
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visserman
Platinum Member
1072 Posts |
Posted - 03/03/2006 : 19:41:50
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Good point Steve.
Eeone it is quite logical that you will not hear any strange noises when you place the GE-7 after a distortion as distortion produce a lot of noise themselves that is just the nature of the effect.
You will find that the GE-7 is a little noisier that the GEB-7, GEB-7 compresses in a nice way, GE-7 does not do that.
...........and in case you were thinking if the Taiwanese version is any better, no, both pedals do sound the same!! Both are a little noisy.
Check again with your powersupplies, the Jap version wants an ACA when you use the pedal on its own, when you combine it with other Boss pedals you could use a PSA powersupply. Try also with fresh batteries as Steve suggested before, and see what the results are.
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stahlhart
Platinum Member
1318 Posts |
Posted - 03/03/2006 : 21:25:13
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PQ-4
C.K.
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eeone
Bronze Member
Yugoslavia
121 Posts |
Posted - 03/03/2006 : 21:30:31
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First of all, thanks guys...
I did try putting a fresh battery, but it didn't help. And I know the noise cannot be heard cause of the distortion.
I do not own ACA nor PSA adapter nor I don't know anyone who does. I have only a radio shack adapter with a switch to select voltage and polarity but it doesn't produce any extra noise. The pedal works with it but LED doesn't light.
I'll post pictures and ,less probably, sound samples in an hour or two. |
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phostenix
Gold Member
USA
754 Posts |
Posted - 03/04/2006 : 07:51:13
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I'm looking at the schematic for the GE-7 and the only thing that is common to all the sliders is IC4. It's a 4558 op amp. If you are comfortable replacing components, I'd try changing that out. IC's 1, 2 & 3 are grouped together on the PCB. IC5 is an 8 pin inline chip, so IC4 is pretty obvious on the board.
Let me know if you want any more info.
Grace and peace,
Steve
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Edited by - phostenix on 03/04/2006 08:15:14 |
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stahlhart
Platinum Member
1318 Posts |
Posted - 03/04/2006 : 15:10:37
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Has anyone ever tried substituting the Burr-Brown op-amps for the 4558s is this pedal? Metal film or tantalum capacitor upgrades?
C.K.
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eeone
Bronze Member
Yugoslavia
121 Posts |
Posted - 03/04/2006 : 21:40:57
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quote:
Originally posted by phostenix
I'm looking at the schematic for the GE-7 and the only thing that is common to all the sliders is IC4. It's a 4558 op amp. If you are comfortable replacing components, I'd try changing that out. IC's 1, 2 & 3 are grouped together on the PCB. IC5 is an 8 pin inline chip, so IC4 is pretty obvious on the board.
Let me know if you want any more info.
Grace and peace,
Steve
Yes, I would appreciate any help.
I've downloaded the ge-7 schematic from the free info society and there is a suggestion for a lower noise mod, here :
http://www.freeinfosociety.com/electronics/schematics/audio/bossge7.pdf.
It says that ic4 should be replaced with another JRC op-amp. I looked through some catalogues of the stores that sell these things here in Belgrade and none of them seem to have JRCs. Any suggestions for a replacement?
Do you think that replacing capacitors and putting metal film resistors, as stahlhart suggested, would help?
I'll post sound samples tomorrow. |
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VH100R
Copper Member
Portugal
37 Posts |
Posted - 03/18/2006 : 03:36:35
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I have that schematic too. Since I want to buy a ge7 and gonna mod it for low noise I would like some sugestions from some who did it.
By the way check the monte allums ge7 mod. There are some pictures of the kit and you can see all the components used.
Anyone tried this? or tone-jams sniper ge7 mod? |
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GE-7, again
