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Old 05-17-2006, 08:24 PM   #1
That_Pink_Queen
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The Wah Modding Thread! Crybaby, Vox, etc.



I've spent some time coming up with this mod...it sounds excellent to me, I incorporated ideas from the original Clyde Wah, the Jimi Hendrix signature wah, along with a bunch of other slight changes. There's a sweep mod to make the sweep smoother, which partially remedies the issue of the kind of not so smooth sounding wah pot. I've modded it to boost midrange. The transistor changes are optional, but very nice sounding IMO. Give it a much more smooth and warm tone. The buffer and true bypass details can be found at:
http://www.stinkfoot.se/andreas/diy/mods/dunlop.htm
I've also added a pot to modify the vocal-ness of the sound, and a switch to change it into a volume pedal too
You could easily tweak this even further to your individual tastes...I'll give a more detailed breakdown later on for people who want to mod even more. Check back later at www.stompboxmods.com later if you're interested.

A new inductor and new pot would make it much nicer too...expect to pay around 30 bucks for a new pot and inductor combined if you want one. Germanium tranistors can be found at www.smallbearelec.com or from Aron Nelson at www.diystompboxes.com


Now for sounclips...
http://www.stompboxmods.com/misc/stock.mp3
That's the stock setting, the guitar is out of tune, but you can hear how bad it sounds
I'd rerecord a stock clip, but of course its not stock anymore.
Stock this is a very harsh, trebly wah with weak bass and bad midrange. The sweep is very aprupt.

Modded soundclips coming soon though.
Sorry for the wait.


Now, you may be asking why I mentioned Vox in the title...

Almost all these mods apply to Vox pedals too. If you email me a full resolution pic of the front side of your Vox PCB, I can post details for modding that too to similar spec's.



Kudos go to mostly GEOFEX.com for RG Keen's excellent breakdown of a standard wah circuit. Some credit should also go to Justin Philpott for his effect schematics of the original circuits.
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Old 05-17-2006, 09:25 PM   #2
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That's awesome. If I had any money whatsoever, I'd pay you to mod my Vox.
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Old 05-17-2006, 09:40 PM   #3
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^Do it yourself, for around 3 bucks...its super easy.
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Old 05-17-2006, 10:07 PM   #4
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I'm quite interested in this mod for my V847. I can get you a pic sometime within the next few days, and it'd be awesome if you could set me up. Thanks!
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Old 05-17-2006, 10:17 PM   #5
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ill see if i can get my board up.......ive been going mod crazy on my wah lately so ill do some more......

heres a simple mod for all you guys......


change the circled resistor to a 68K resistor........



will that pic do ok?
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Old 05-17-2006, 10:35 PM   #6
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^Yeah thanks.

And v12, if you could PLEASE keep adding mods to www.stompboxmods.com, that would be so awesome...its hard getting a foothold on google/the internet in general without any content.
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Old 05-18-2006, 03:08 AM   #7
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Hmm this thread reminds me i need to do some more mods to my crybaby. It is a GCB- 100 it was orginally a bass wah that i modded to be a guitar one. I made it true bypass, di a vocl mod and added abut of midrange.

Are there any mods you recommend?
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Old 05-18-2006, 03:32 AM   #8
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^Transistor change? It made my wah alot less sterile and thin sounding and gave it some "oomf." I also reccomend increasing the gain/bass response a bit, thats the one with the 390 ohm resistor off the emitter of Q1...


Btw, if you could submit the mods you did to the bass wah to the site www.stompboxmods.com that would be really cool...

Thanks!
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Old 05-18-2006, 01:06 PM   #9
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This is a dream come true!

I have a 15 year old GCB-95 that I aint tried yet. How different do these actually sound to the new ones?
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Old 05-18-2006, 02:56 PM   #10
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Ha, I'm just going to make a new PCB for my wah. Out of frustration with the general ****tyness of the tone (a new GCB95 crybaby) even mods couldn't save it. Part will be salvaged when I get around to it (eg: when I can manage to order a nicer inductor).

I also think I may have lost one of the rubber feet (but that doesn't matter because it's more Hendrixlike that way )
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Old 05-19-2006, 07:28 PM   #11
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Originally Posted by the1
This is a dream come true!

I have a 15 year old GCB-95 that I aint tried yet. How different do these actually sound to the new ones?



Way better

And seljer, all mod schematics are EXACTLY the same in terms of PCB traces etc. The only difference is components. Really. Look at a schem
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Old 05-19-2006, 10:47 PM   #12
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Quote:
Originally Posted by That_Pink_Queen
^Do it yourself, for around 3 bucks...its super easy.



I'd eff it up.. haha.
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Old 05-19-2006, 11:15 PM   #13
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^I doubt it.
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Old 05-19-2006, 11:31 PM   #14
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That pink queen- i did that mod you suggested, it's nice. But i'm thinking of building a t new circuit for the wah though. I'll post those mods i did on the bass wah on your site soon, I might do a mod where i can switch between bass and guitar wah.

Poochy- Modding a wah is a easy project, it's a good way to get into pedal building.
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Old 05-20-2006, 12:27 AM   #15
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Yeah...I think I may get a new inductor too, maybe a red Fasel. If I do I'll tell you how it goes.
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Old 05-20-2006, 03:47 AM   #16
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Quote:
Originally Posted by That_Pink_Queen
Way better

And seljer, all mod schematics are EXACTLY the same in terms of PCB traces etc. The only difference is components. Really. Look at a schem


yeah I know. I think I screwed up one of the traces when modding the 33kohm resistor. I generally don't want to be reminding of thing in any way

I'm also trying to figure whether or not to use ouput and input buffers.

Last edited by seljer : 05-20-2006 at 03:53 AM.
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Old 05-20-2006, 04:11 AM   #17
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^Yeah..I was soldering one pad, and I barely applied any heat, but the whole pad just fell off...pretty ****ty really. My home-etched PCB's are tough as a rock, these guys just seem to splinter.

I think I may try a new inductor...Geofex had a great article about how the original Vox inductors were wound off center or something crazy, which made them sound nice.


What's involved in winding your own inductor exactly? Is there a set of calculations to figure out the core size, etc? I have a bunch of extra guitar pickup wire.
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Old 05-20-2006, 04:19 AM   #18
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Quote:
Originally Posted by That_Pink_Queen
^Yeah..I was soldering one pad, and I barely applied any heat, but the whole pad just fell off...pretty ****ty really. My home-etched PCB's are tough as a rock, these guys just seem to splinter.

I think I may try a new inductor...Geofex had a great article about how the original Vox inductors were wound off center or something crazy, which made them sound nice.


What's involved in winding your own inductor exactly? Is there a set of calculations to figure out the core size, etc? I have a bunch of extra guitar pickup wire.


well I've never managed to understand the formula personally, its somewhere on: http://en.wikipedia.org/wiki/Inductor and then you can make it out of any stuff you have
http://www.ee.surrey.ac.uk/Workshop...oils/index.html


otherwise just try: http://www.arielfx.com/inductor_guide/guide.htm
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Old 05-20-2006, 04:26 AM   #19
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Nice...
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Old 05-20-2006, 12:23 PM   #20
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Is it worth buying a Fasel Inductor for my wah? I want to play Alice In Chains, Metallica, Pearl Jam
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