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| IZZI |
 Posted: Mon Aug 29, 2005 12:45 am Post subject: DIY: Modifying Wah wah ( Crybaby or Vox model) |
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Joined: 11 Dec 2004
Posts: 3447
Location: Melbourne, Australia
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Reference pictures for Vox(left) and Crybaby(right)
 
What can you do?
These mods are all fairly cheap to do and they're reversible, so it's not the end of the world if you don't like the results. Refer to the photos below if you're not sure which parts to change.
"Vocal Mod"
Replace the 33K resistor in parallel with the inductor with a 68K. This gives a more vocal quality to the wah. Some Vox Clyde McCoy wahs had 100K resistors here.
Gain and Bass Response
Replace the 470 ohm resistor (some have 390 or 510) at the emitter of Q1 with a lower value. This increases gain, which is useful if you've converted to true bypass. The bass response is also increased. Too low a value here may introduce some distortion and make the wah sound muddy. Try 270 - 330 ohms to start with.
Midrange
Replace the 1K5 resistor between the base of Q1 and the inductor with a larger value. This increases the midrange and helps if your wah sounds dull and muted when you rock the pedal back. Try 1K8 to 2K7. Higher values than stock also smooth out the bass-treble transition. Most people refer to the 33K as the "Q" resistor, but this resistor also affects the Q.
Sweep Range
Change the sweep by swapping the 0.01µF cap between the emitter of Q2 and the inductor. A smaller value will make the wah sweep more trebly and vice-versa. If you're converting to or from a bass wah, this is the one to change. Try 0.068µF for a bass wah.
Volume
If you've converted to true bypass, replace the 68K series input resistor with a lower value, say 47K. This gives a slight increase in volume. Too low a value is likely to result in the pedal picking up radio interference. This can be addressed by adding small value (10 - 20pF) capacitors between the collector and base of each transistor.
if you want to do true bypass mod, go here :
http://homepage.ntlworld.com/s.castledine/greenfuz/wah.html
Cheers
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| Erylasia |
| Posted: Mon Aug 29, 2005 12:48 am Post subject: |
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| deadzid |
| Posted: Mon Aug 29, 2005 10:51 am Post subject: |
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wahhh teruja nih, teruja sesangat nih!! tak sabar nak tunggu Vox V-847 Wah aku sampai, aku akan mod dia kasik true-bypass, so save budget aku, boleh reduce looper aku jadi 3 loop je!
tapi aku tak geti nak solder2 nih, hancur board tu karang, ada sapa2 boleh bikin?? mintak tolong sskl la heheeh...
oh yea lagi satu, camne kalau nak modified Vox Wah nak kasi boleh power up dgn adaptor?? so takde la dependant dgn bateri je...
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| sskl |
| Posted: Mon Aug 29, 2005 1:55 pm Post subject: |
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Joined: 13 Dec 2004
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i can help u with modification  .. but i dun have the driller to drill the hole for 9vol..Actually the 9 vol just sambung from the bateri red and black wire . settle .. i want to try the mod tat Uses the POT to let u set the mid range, bass(robert keleey modding) .. but alot of works (i got no time) and no driller also 
deadziz..u dah ada dpdt switch? ..PS: bukan 3dpdt. |
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| IZZI |
| Posted: Mon Aug 29, 2005 2:23 pm Post subject: |
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Joined: 11 Dec 2004
Posts: 3447
Location: Melbourne, Australia
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wow.. variable mid range and bass would be as cool as joe satch GCB-535! ahhh excited gila!
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| deadzid |
| Posted: Mon Aug 29, 2005 3:08 pm Post subject: |
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sskl: i've read somewhere that modifying it by just connecting to the battery kinda thingy will produce some sort of hum... dunno la, maybe i was wrong?
apa beza 3PDT vs DPDT?? bukan 3PDT lagi advance ke? hehe
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| sskl |
| Posted: Mon Aug 29, 2005 5:10 pm Post subject: |
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You also can use 3pdt.. if i not wrong,, our original wah v847 uses SPDT.. i forgoten wat the different..between dpdt and 3pdt.. i not really a professional anyway  ..
yeah.. the 9vol shouldnt cause any trouble.. if u jsut ground it  .. the hum came out because dun have grouding... but i havent try yet.. but according to the theory.. no grounding= hum
\\damn.. i want put in all the mod into my ummoded v847
anyway.. one day we all come together and work together lar ! |
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| okta |
| Posted: Mon Aug 29, 2005 8:07 pm Post subject: |
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i have a old Maxtone wah( I know not no one heard of this ). . . bought it long time ago. . . don't like it much . . anyoneu guys think it can be mod to sound good?...
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| IZZI |
| Posted: Mon Aug 29, 2005 8:14 pm Post subject: |
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Joined: 11 Dec 2004
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Location: Melbourne, Australia
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dont mod it bro.. what u have to do is just give it to me as a present.. 
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| Erylasia |
| Posted: Mon Aug 29, 2005 8:15 pm Post subject: |
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| okta |
| Posted: Mon Aug 29, 2005 8:18 pm Post subject: |
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| kalau aku bole etik duit dari pokok ...aku bagi jer...lol... |
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| Erylasia |
| Posted: Mon Aug 29, 2005 8:21 pm Post subject: |
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| IZZI |
| Posted: Mon Aug 29, 2005 8:59 pm Post subject: |
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Joined: 11 Dec 2004
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Location: Melbourne, Australia
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gcb 95 ada byk model beb.. aku punya Rev G.. ko punya Rev berapa ery?
cuba bukak back plate dia pastu tgk kat PCboard dia ada tulis Rev apa..
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| Erylasia |
| Posted: Mon Aug 29, 2005 9:10 pm Post subject: |
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| IZZI |
| Posted: Mon Aug 29, 2005 9:42 pm Post subject: |
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Joined: 11 Dec 2004
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Location: Melbourne, Australia
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bezanya Rev G = Gempak.. rev H = Hampeh
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