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Grey Clone Manual

Wilson Effects Grey Clone


A faithful reproduction of the infamous 250mh grey wah

Late 60's vintage tone!

The Grey Clone was originally designed for Andy Martin of Reverb and Tone Report fame. I was 
contacted to build a Vox Grey Clone that had a little
bit extra flare. The pedal needed to nail the tone of the original 250mh model that was played by Jimi 
Page in the early Zeppelin years. Well needless
to say we nailed it and people started asking if we were going to make these available to the public, so 
here it is. Modeled after that classic circuit you
can achieve those tones straight out of the box or if you like to tweak a bit there are plenty of options. 
Here's what goes into every Grey Clone;

Built with NOS tropical fish capacitors

Carbon Composition Resistors throughout the Wah circuit

BC109B Transistors

NOS Clarostat Hot Potz 1

True Bypass switching. The pedal comes without an LED but one can be added

Fuzz Friendly output buffer, so your pedal works well with fuzz and overdrives

Custom wound Red Sparkle 250mh Inductor made by Joe Gagan

Growl trimmer - adds bass and gain to the circuit if desired or eliminates it

Mid-Range trimmer - adjusts the amount of mid-range in the sweep of the wah

Sweep Range trimmer - adjusts the width of the sweep or depth if you prefer

Boost trimmer - The Grey Clone has an incorporated boost circuit that allows you to push the volume far 
beyond unity gain. Actually I highly
recommend not using full boost as it can cause unwanted noise and actually breakup your amp.

6 Position DIP Q Switch - This allows you to dial in a variety of different wah tones.

The pedal also uses Neutrik input and output jacks and runs off of a 9 volt battery or center negative Boss 
style power supply.

You also get a one-year warranty on parts and labor. Please see our FAQ page for what this warranty 
includes. If you should happen to have any
questions about the Grey Clone or any other Wilson Effects pedal please feel free to contact me 
through the contact form on the Home page of the site.

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