I saw a request for this effect, and strangely enough I have been looking at making one of these of awhile. Not a whole lot of info on this out there, but here’s what I found on the Chicago Iron site about there clone of it.
The
Tycobrahe Parapedal was unique in that it used two pots to create it’s
own incredible wah type sound. The Parapedal
was made in the mid seventies by Tycobrahe Engineering and has become
quite a collectors item, that is – if you can find one. They were made
in such small quantities that their value has sky-rocketed. Ask any
vintage effect dealer for one(if they can find one).
What I do know is that Geezer Butler and Tony Iommi both used one, and that’s enough of a reason for me to build one. Just listen to N.I.B. and you’ll hear it on Geezer’s bass solo intro.
Original was Positive Ground:
I also made the few changes to make it Negative Ground so you can daisy chain it:
