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That_Pink_Queen
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#1


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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poochy
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#2
That's awesome. If I had any money whatsoever, I'd pay you to mod my Vox.
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That_Pink_Queen
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#3
^Do it yourself, for around 3 bucks...its super easy.
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Zeppelin256
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#4
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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V12prowler
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#5
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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That_Pink_Queen
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#6
^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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dave293
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#7
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?
That_Pink_Queen
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#8
^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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the1
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#9
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?
seljer
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#10
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 )
That_Pink_Queen
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#11
Quote 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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poochy
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#12
Quote by That_Pink_Queen
^Do it yourself, for around 3 bucks...its super easy.



I'd eff it up.. haha.
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#13
^I doubt it.
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dave293
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#14
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.
That_Pink_Queen
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#15
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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seljer
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#16
Quote 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 at May 20, 2006,
That_Pink_Queen
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#17
^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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seljer
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#18
Quote 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/advice/coils/index.html


otherwise just try: http://www.arielfx.com/inductor_guide/guide.htm
That_Pink_Queen
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#19
Nice...
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the1
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#20
Is it worth buying a Fasel Inductor for my wah? I want to play Alice In Chains, Metallica, Pearl Jam
Dave_Mc
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#21
awesome, man. I'm keeping a close eye on this, since I have a crybaby.

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That_Pink_Queen
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#22
I can't say how much a new inductor will change things...I've heard its a pretty sublte difference.


And thanks dave.
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#23
Quote by That_Pink_Queen
I can't say how much a new inductor will change things...I've heard its a pretty sublte difference.


And thanks dave.


To whatl I've heard its a huge difference. Espescially if you're comparing say, one of the halo replicas to the regular black one thats in the GCB95 crybaby.
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#24
Haha, I've heard the opposite. I guess someone will have to try one eh?
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#26
The halo replica is only £20, and if fixes the tone up I may consider installing it
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#27
Quote by seljer
To whatl I've heard its a huge difference. Espescially if you're comparing say, one of the halo replicas to the regular black one thats in the GCB95 crybaby.


dunno about the different models, but i know lewis said that changing the inductor was one of the things that you wanted to do, because the stock one was one of the things that made the stock one suck so much...

Hearsay, granted.

Quote by classicrocker01
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godofshred
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#28
Quote by Dave_Mc
awesome, man. I'm keeping a close eye on this, since I have a crybaby.



that you havent touched since it was bought
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#29
^ sure i have. I just haven't modded it.
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godofshred
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#30
sorry, i meant your soldering iron i lost half of what i was supposed to say
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#31



true.
Quote by classicrocker01
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t heff
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#33
ok so modding wahs i know nothing about, anyway to make my bass crybaby a guitar crybaby with a lil bit more gain then a normal wah, a smooth sweep, and make it well to be honest funky, and of corse clear
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seljer
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#34
Quote by t heff
ok so modding wahs i know nothing about, anyway to make my bass crybaby a guitar crybaby with a lil bit more gain then a normal wah, a smooth sweep, and make it well to be honest funky, and of corse clear


Find the 0.068uF (68nF) capacitor and change it up to 0.01uF to shift it from bass to guitar frequencies (and the opposite to turn a guitar wah into a bass wah)
the1
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#35
Woah, gotta keep this thread alive!

How should I mod my 15yr old GCB-95 to get that Jerry Cantrell Wah-Sound?
love_O_rock
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#36
You keep busy don't you?

I might look into this.
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#37
has anyone disected a dunlop 95Q? i was looking for a parts list to do the touch sensitive true bypass rather than clicking the toe down or can anyone suggest so parts carried by radioshack to do this mod or something close to it
That_Pink_Queen
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#38
I have no clue how to do the touch sensitive thing...but I doubt Radioshack would have the stuff. And I think the 95Q is an opamp based wah, which means many of these mods won't be as directly transferrable.
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Yerffej
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#39
lets say that person x, who will remain nameless, had a stock gcb-95 and access to parts. would person x be able to rig the wah (with a 3pdt switch) to switch between wah and volume pedal? would the volume pedal taint the tone in any way? would it be quieter or would it be capable of boosting the signal? is there a schematic available for this somewhere or a more indepth one stating what each part of the huge mod at the beginning of this thread does? person x is hesitant to go solder crazy without knowing what all these things would do.
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That_Pink_Queen
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#40
Q1 and Q2 were originally an MPSA-18. IMO, it sounded a bit sterile and clean, so I put a germanium transistor. The germanium flavors the tone a bit and makes the pedal warmer. Q2 was replaced with a 2n3904 silicon transistor, which I thought sounded better. The transistor in the second position is just a little buffer, and it's not too important as long as the gain is over 175 or so. Both the transistor changes aren't super important, it just gave it a nice touch I thought. If there's part of the mod to skip, it's this one.

The changing of the 68k resistor to a 39k resistor, and the change from a 390 to a 330ohm resistor was prompted by the removal of the buffer. The buffer apparently adds a small boost to the overall gain, and so when I took it out, the volume of the pedal dropped a bit. Lowering the 390ohm resistor feeds more current into Q1, boosting the gain. The changing of the 68k resistor to a 39k resistor is the input of signal, this was also lowered to let more signal in.

Changing the 1.5k resistor controls the middle frequencies of the circuit, and IMO, the abruptness of the sweep. The 2.2 replacement I used seems to work fine here, it's a bit smoother, and definitely warmer and less "scooped" sounding. I really recommend this mod.

There is a 33k resistor paralleling the inductor in the stock Crybaby. I looked at the old Clyde McCoy wah schematic, and noticed a 100k resistor here, so I decided to throw in a 100k pot to be able to tweak this as much as I wanted. IMO the pot is a bit excessive, I usually leave it at around full anyways. Sometimes with really heavy distortion though, I think it sounds better with the resistance ~50k.

And now for that volume pedal mod---this one is awesome! It's really easy, just make a toggle to disconnect one leg of the 4.7uF capacitor. This takes all the sweep out, and just leaves you with a nice volume pedal. The coolest part is that it leaves a bit of a boost, and then allows you to sweep through unity gain, and then down to nice and quiet when you press down the heel. You can't mute it all the way, but it's a really good mod. I ended up relocating the 4.7uF capacitor on a little piece of perfboard, just to make things easy. It will work as long as the right connections are made/broken though. One thing is that it seems to bleed off a bit of treble. IMO this isn't really worth fixing, it's a minor issue IMO.

The last really important mod here is the .01uF to .022uF mod. This controls the sweep range of the wah. I read that the Jimi Hendrix signature wah had a .022uF cap in here, so I went ahead and tried it. It helped significantly, really fattened things up. If you want a lower sweep, go ahead and make this value higher, or vice versa.
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Last edited by That_Pink_Queen at May 25, 2006,