Request for two small steel rod-esque lathed part!

[HankMcSpank]

I'm sure you've grasped it all, but from my (quick) understanding the much cherished old VOX wah were analysed under lab conditions & ultimately acted in a way that wasn't expected. It would appear the inductor core (which is made of ferrite not meant to have to hold any permanent magnetic qualities) had become in part magnetized (he'd guessing the DC current the wah circuit has permanently running through the industor may have led up to this). The end result is that when you feed an AC signal into the inductor, the inductor core will saturate faster in one half of the signal waveform than the other...apparently this sounds good in a wah circuit! (I can't say...this is all news to me!)

Therefore he goes on to hypothesize that this could be 'frigged' using a modern bespoke wound inductor, buy adding a second winding and then pumping some DC current through it. This would generate a magnetic field, utlimately turning the ferrite core into a pseudo magnet...you then have the aformentioned non linearity that is sought.

he doesn't give any figures for the amount of turn the second core should have...so you'd be very much into trial & error territory. And without having access to his data (scope traces at set frequencies for the original VOX inductor etc), it'd likely be a futile (& long drawn out) affair!

But by the looks of it, the inductor used in the Wah circuit has a ferrite core, an inductance of 500mH and about 50-70 ohms of DC resistance. I'm not sure how physically big those inductors are, but that surely amounts to a lot of windings (so I'm guessing they use very thin copper wire)