Vox - Wah Wah Distortion  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...

Re: Vox - Wah Wah Distortion

Postby Rocket Roll » 30 Nov 2014, 18:24

Pots are OK, it's just that I cannot check their value since the pedal is already on its way back to its owner :) This second example had a problem with footswitches - I had to replace those eight-pole double-throws with regular DPDT's.

Now that I've mentioned it, here's a drawing of how the original footswitches connect. It's not mine, but it works:
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Re: Vox - Wah Wah Distortion

Postby ljn » 30 Nov 2014, 18:41

I can't say I've ever seen a footswitch wired like that before. But if it works, that's good enough. I also don't have any experience with authentic vintage pedals, either. But, I have plenty of experience with bad, or scratchy pots.
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Re: Vox - Wah Wah Distortion

Postby jag775 » 21 Dec 2015, 15:40

Rocket Roll wrote:So, here we have the fuzz part of the circuit (minus Volume and Fuzz pots and 10uF capacitor mounted on the Fuzz pot), and the schematic. I have modified the Cosmosound Distortion Whau Repeat schematic that you can find on the Effectsdatabase (http://files.effectsdatabase.com/docs/s ... ematic.gif). The values are mostly OK, but the author of that one had a different unit or made a mistake: R2 is 27K and R5 is 2K7 in the VOX, as all of the pictures clearly show.

I cannot check the potentiometers' value, but I expect no problems there.

So, not your typical silicone Fuzz Face, but a variant.

Very useful information! Thanks ;-)
I've just fixed a Silversound SE-20 but resistor R5 seems to be 270 Ohm as factory value. I hope to have time to post some pictures and other information in the coming days.
I confirm the unusual switching wiring!!
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Re: Vox - Wah Wah Distortion

Postby jag775 » 21 Dec 2015, 15:47

Sorry, R2 is 270 (resistor connected between 10K and power supply).
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