November 9th, 2009, 11:59 AM
I want to open up my Crybaby (the old Hendrix model) and true bypass it and add an LED, I know those are pretty standard mods.
The one thing I'm also wondering about, that seems unlikely - is there a way to install a switch that would convert it to a volume pedal? I imagine the pot in there doesn't quite work in a way that this is possible, but does anyone see a way around that?
November 9th, 2009, 12:22 PM
I ran into some info on this when I was modding my Crybaby for true bypass.
This isn't it (http://www.wah-wah.co.uk/index.html), but it addresses the issue. It sounds like it's not great news for you.
On the other hand, I prefer a volume pedal with a looser sweep though. The wah action on Crybabys is too stiff for the subtle control I'd like. It's fine for the stab-stab-stab wah action though.
November 9th, 2009, 09:58 PM
I found this info , as mentioned, the wah will not feel the same as a dedicated volume pedal , Ernie Ball for example, and it may not have as long a sweep either, but it's an easy and reversable mod, and with some engineering you could have both wah and volume, (not at the same time)
Wah-Volume pedal mod
Lifting the earth connection of the 4.7µF capacitor will cancel the wah effect and leave you with a volume pedal. The '70s Jen Wah-Volume pedal switches in a 4K7 resistor and 0.22µF cap in series across the 0.01µF "sweep cap".
If you run a simple on/off switch (the kind you'd find in a very simple circuit) between the capacitor and the earth, you can toggle between volume and wah pedal- the only difficult bit would be in mounting the switch on the steel enclosure.
November 10th, 2009, 12:10 PM
not to get too far OT, but i've been baffled as to why somebody (besides Morley) doesn't come out with a decent volume/wah ... i had one in the early '70s (Boomerang, maybe?) that worked pretty well given the trade-offs. i'm sure it would be considered a tone-sucker today, but maybe with true bypass ... ???
November 10th, 2009, 05:29 PM
Yeah... my Vol/Wah was a Rogue... Talk about a Tone Sucker. I'd be interested to see a mock up schematic with a SPDT switch... hint... hint...
November 10th, 2009, 09:22 PM
You know, it sounds like the problems with the Crybaby (other than the feel) are:
1. The sweep, which does not cover the full range of the pot, resulting in a volume pedal that would either be not fully on, or not fully off.
2. The volume mod seems to adversely affect the wah function.
Well, a 3PDT stomp switch could easily switch the leads of the pot from a full-on wah setup to a full-on volume setup, so that should take care of number 2. After that, it seems like it's just a matter of engineering the pedal to use the full sweep of the pot. Since Dunlop actually markets a volume pedal, it seems like this is entirely possible. If this is truly the case, then it seems like the way to go might be to build a wah into that volume pedal, which being that it shares a similar case with the wah, shouldn't be a problem.
November 13th, 2009, 06:39 PM
Ben is right. Typical Wah's when converted have a sweep issue. Not enough room from heel to toe, or not a good swell, or too fast a change. My Ernie Ball has more range and a better taper for Volume pedal uses.
I had modded my Crybaby with a switch for Volume or Wah and instead changed it to a bass/guitar switch... it was just not that good of a Volume pedal.
As far as true bypass that is easy. Search Google for wah mods. If you want an LED that doesn't cause noise issues, you will need a 3PDT switch. If you just want true bypass without an LED a DPDT switch will work fine. You will need to remove the buffer, if yours has one.
As far as adding a Volume/Wah switch, it will simply lift the ground on one capacitor as mentions. A mini SPDT should do it.