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Wah Pedal Mods
Avatar for pfeifferpedals
pfeifferpedals
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I'm modifying a Dunlop Crybaby GCB-95. I've done the tru-bypass and also added an adjustable wah level pot and tried to lower the frequency a bit using the mods here: http://www.stinkfoot.se/andreas/diy/mods/dunlop.htm#_modding_the_wah

I'm wondering if the inductor will make a difference because it still sounds pretty flat with not a lot of tone. The inductor in this particular pedal is fastened with a small nut and the copper wires are exposed. Looks pretty weak.

Has anyone replaced inductor? What was the result?

Thanks!

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http://www.pfeifferelectronics.com

Post Date: 4/17/2009 @ 12:09 pm
RE: Wah Pedal Mods
Avatar for R O Tiree
R O Tiree
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I modded a GCB-95 for a G-Netter and I know of others who have done this kind of thing as well. Bottom line? Buy a Teese.

However, if you can't, then it's mod time.

One problem can be that, when you take it apart, you don't properly document (and mark) which tooth of the quadrant gear was opposite which tooth of the pinion gear on the pot and the precise angle of the pot on its mounting. Get it in the wrong place and it will either be too bright and fizzy, or dull and muddy. Marks can get rubbed off so the best way I found to do this is to de-solder the wires from one outer lug of the pot and then measure the pot value from that "free" outer lug to the wiper with the pedal fully heel down. When you re-assemble, don't tighten the pot fully in its recess - just finger-tight will do. Put the pedal heel down, then turn the pot casing until the pot reads the correct value and then tighten up. Only then should you re-solder the leads to the pot.

Inductors make a big difference. Fasel yellow is my favourite sound, but it's microphonic. The Eleca Halo is also good and less prone to microphonics. The Fasel is just enclosed in fairly flimsy plastic. One that I got had a crack in the casing and you could hear the coil/core assembly rattling inside. Not surprisingly, you could actually talk into the pedal and hear it through the amp. I tried wax-potting it and it changed the character completely and it sounded horrible. If you must use a Fasel, then I'd suggest rack-mounting the circuit and remoting the treadle and switch - that way, every time you press the engage switch, you don't get an enormous "THOCK" through the amp. The Halo is much more solid, but I didn't really like the sound very much - just my ears, I guess. What is interesting about the Dunlop board is the number of pad holes in the circuit board to accept any of several inductors - it's as if they know that the stock one is a POS and that people will want to try different ones. The one you have sounds like it's a Rev E board, given the inductor style (with a nut holding it together). Later ones have a plastic cylinder around them. The mojo one is known as a "stack-o'-dimes", IIRC, because that's what it looks like, covered in brown goop. Cost many $$, those.

When I did these mods, I found that I went too far, too quickly... "Ooh, yes, I'll do that, and that, and... that one as well," and ended up with something that really didn't sound as good as I expected and totally different from the stock pedal. The only way to sort it out was to return it to stock, then try one thing at a time, then decide which mods I wanted to do, and by how much, in order to achieve a pleasing result. Whether other people think what I have now is pleasing is... moot.

Hope my ramblings helped. Smiley

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...you fritter and waste the hours in an offhand way...

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Post Date: 4/17/2009 @ 3:01 pm

RE: Wah Pedal Mods
Avatar for pfeifferpedals
pfeifferpedals
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Thanks for the help RO. Very, very helpful.

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http://www.pfeifferelectronics.com

Post Date: 4/19/2009 @ 11:11 am

RE: Wah Pedal Mods
Avatar for SoundIdeaMods
SoundIdeaMods
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You might want to check out the "whipple" inductor. I've tried it and it sounds good. Another option is to replace the 33k resistor in parallel with the inductor with a higher value to change the frequency of the "Q". Any value up to 100k is good. Another option would be to add a 100k linear taper pot for Q adjustments.

http://www.soundideamods.com

Post Date: 4/25/2009 @ 6:51 pm

RE: Wah Pedal Mods
Avatar for R O Tiree
R O Tiree
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Duane - I found out the pukka method of setting the pot on a GCB-95 and similar pedals that use a rack and pinion actuator...

1. Loosen the screw holding the friction spring and get it out of the way of the black rack gear.

2. Wire the pot up and then set it in the jaws and tighten the nut.

3. Place the pedal upside down and with the treadle in the fully toe-down position with the pot on the left and the circuit board on the right.

4. Turn the pot fully counter-clockwise (looking at the pinion gear).

5. Lay the rack gear up against the pinion gear and engage it. Now release the pressure and rotate the pinion by one tooth clockwise and re-engage the rack gear.

6. Slide the friction spring into place and tighten the screw.

Job done.

It is essential that you back off by one tooth, because in order to engage the stomp switch, you actually compress the forward bumper. Since you are continuing to push the treadle further toe-down, the pinion gear will rotate a little further. Clearly, then, if you engage the rack gear without backing off by one tooth, you'll break the $25 pot the first time you engage it! Oops...

I found out a lot about wahs this weekend and, if you're interested, I can point you in the right direction to get mods to turn any GCB-95 into a Colorsound-style wah, which is a bit more expressive and vocal than a Crybaby.

--------------------------------------------------------------------------------
...you fritter and waste the hours in an offhand way...

Lord High Mucky-Muck of the International Pink Floyd Fan Coalition
Technical Master of the International Booty-Que Pedal Coalition Smiley
Owner of a 1224Mk12a UK Matamp Coalition Smiley
Founder Member of the "Get Marty a Bowel Movement" Movement. Smiley
Fellow of the Get Brotha Alwalt a Flag Coalition



Post Date: 4/27/2009 @ 9:10 am

RE: Wah Pedal Mods
Avatar for alfalfasprout69
alfalfasprout69
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id have to agree with the comments already made... i did the same mistake of modding everything on the stinkfoot tutorial and didnt like the results....

i totally agree with changing just one thing at a time and testing before you commit to the next component change. the best thing to do would be to use a bunch of Pot's and then play around with your wah until you find the sound you desire, then de-solder the pots and replace the resistors with the measured values.

iv got two GCB-95 crybabys a late 80's to early 90's model and the latest GCB-95. the old one actually sounds a lot better then the brand new wah. they are the same but you can really hear a noticeable difference. why? i really dont know...

as for inductors iv found they are not that consistent iv had a few, iv tried both the yellow and red fasel's actually i had come across two red fasel's and i can tell you they didnt sound the same, similar but noticeably different.

the inductor in my older crybaby sound better then my newer crybay's. i replaced the newer crybaby with a whipple inductor and its a better sound, not a big difference but enough for when it counts.

tried an eleca halo and its pretty good but still not that happy. im currently waiting for a Sabbadius Soul Inductor so we shall see what thats like... iv even tried small coupling transformers as mentions on "the technology of wah pedals" from Geofx.com, dont bother with the small transformer, it works but its not musical sound very muffled.

the sweep cap's very important you dont have to go to the extremes of a 0.022uf or 0.033uf try in-between 0.01uf & 0.022uf for a more sublte shift that will take away the shrillness of the top range.

replacing the pot will only move the sweet spot of the treadle to a different place, you may or may not like it, i replaced mine with an I-Car taper 100k pot and its a bit easier for me to use than the dunlop hotpotz II. you could also increase the value of the pot to say 200k for a bit more of a kinda wider sweep but its not that much of a difference and can get a little hard to control.

a big tonal difference for better (or worse) is to change the transistors to lower gain types like a BC109C or something like that. it can make the wah sound a bit more mellow but it could be what you're looking for... you can even play around with the positive voltage input resistor and increase it a bit to get a slight tone change...

there are only a few parts to an inductor wah circuit so you can experiment a lot with little effort... in the end it all comes down to trial and error! we can tell you what sounds good to us with our gear but in the end it's your gear and your wah so you are the only one who can say its whale's or not...

keep experimenting and you will eventually find a sound you like... dont forget that the vox/crybaby is not the be all and end all for wah circuits there's a few other types of wah pedals out there that might suit you better.....


alternatively you could take DIY to the next level... such as the picture below.... its going in one of my wah shells....

Up 5GB HOSTED FREE AT Boxstr.COM

Post Date: 4/6/2010 @ 4:42 am

RE: Wah Pedal Mods
jowutif
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RE: Wah Pedal Mods
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RE: Wah Pedal Mods
thomaslist
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Post Date: 10/21/2020 @ 5:03 am

RE: Wah Pedal Mods
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RE: Wah Pedal Mods
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RE: Wah Pedal Mods
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RE: Wah Pedal Mods
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RE: Wah Pedal Mods
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RE: Wah Pedal Mods
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