Vintage Wah Mods and Repair
Welcome to the vintage wah mods and repair page. If you
own a vintage Vox or Thomas Organ wah and it needs a little
TLC or just some basic repairs in order to get it back up to the
original working condition, or if you would like to give your
vintage wah that extra bit of versatility that some of todays top
of the line boutique wah pedals have you have come to the
right place.
Some things that can go wrong with a wah circuit include,
Failing transistors
Failing capacitors
Loose jacks
Bad solder joints
Dirt and grime build up
And of course the infamous scratchy pot
While in most cases it is impossible to replace the original
parts we use what is called work a like parts or cross
reference modern equivalents.  When repairing your pedal we
will return all of the original parts with your pedal with an
explanation of what work needed to be performed. Of course
costs will vary depending on what repairs need to be done so
please feel free to email mail me so we can discuss what
needs to be done.
Mod Services
Would you like have a wider sweep? How about a growl
control? Or maybe you would even like to have a midrange
control. How about an output buffer so your pedal is
compatible with fuzz? Would you like for your pedal to be true
bypass? Would you like to be able to change the q position?
We can even install an LED if you like.
All of these things are possible here at Wilson Effects.
We can add any of the mods above to your current pedal.
Some of the mods can even be done without drilling any holes
in your vintage enclosure. Here is what can be done without
drilling any holes.
Sweep mod
Midrange mod
Growl mod
True bypass
Output buffer
If you are not so concerned about your enclosure all of the
mods can be externally for easier access for on the fly tuning.
We can also add a Q control to your pedal. Please note that
this may require a total retrofit of your existing board, this
means we may have to replace the original board with a new
one to allow us enough room for all of the mods to be done.
When we perform the mods we will return all of the original
parts that have been modded with your newly modded pedal.
Prices may vary depending on exactly what you would like
done so please feel free to email me for a quote.
Below you will find some sound samples and pictures of a
Thomas Organ Wah that I have retro-fitted and performed a
few mods on.
Thomas Organ with Sweep, Growl , Output Buffer,
New Jacks, DC. Jack, New Pot and True Bypass.
Existing hole was utilized for DC. Jack otherwise it
would be on the opposite side of the pedal.
This is a picture of all of the original components on a new
board. This helped to quiet the pedal down greatly.
This is a picture of the output buffer(notice the volume
control), the new pot and true bypass switch.





The above soundclips were recorded with the wahs pictured
below. Note that when turning the growl pot you with here a
slight scratch in the pedal, this is normal as you are changing
the bias of one of the transistors. They were direct recorded
into a PC from a Marshall TSL 100 using a Wilson Effects
Overdrive and an American Strat with Lindy Fralin pickups.
If you should happen to have any questions about the mods
and service please feel free to email me at the address below.
wilsoneffects@wilsoneffects.com