After a while of non-activities, i took the wah projects by the balls and finished them successfully.
Inductors: one is a Stack o Dimes, the other is called a Hasel inductor, both handmade by the nice guys at ARTeffects in Israel.
Caps: i found an ancient italian preamp with the right caps type and values at a car boot sale, they’re the surf green ones you see on the stack o dimes build. I swapped the cheap greenies you see pictured on the other build with some tropical fish ones, just for mojo sake.
The two wahs do sound different.
PCBs by firstname.lastname@example.org (Greece)
Oh well.. i got this volume pedal for cheap. I also rescued some BC173B and 4x early 70es italian inductors (red, white) from a Farfisa organ i recently dissected.
I bought a vox v847 pcb from a reputable greek seller on ebay.
After cross checking caps and resistors differences, i took the plunge to make a mccoy of sorts.
The mccoy calls for a bipolarised 4uF cap. Somewhere i read the original also used a 3.9uF so a tropical fish of this value was chosen.
I also tried to change the resistance value of the pot from 250k down to 100k as called for by putting a 166 resistor between the lugs 1 and 3 of the stock hotpotz.
Transistors measured hfe: 395 and 320. I used the gainier one for q1.
Upon firing it, the wah was almost non existent.
Measuring the inductor, it appeared to be the same Henrys value as the black 80es inductor of my dunlop crybaby so possibly it’s not the inductor’s fault.
I changed the 3.9uF tropical fish for a 4.7uF blue polarised Philips.
I also changed the pot’s range of sweep, using the “pinion mod”, adding more bass to the curve.
To be contd
Cute auto wah with lots of flexibility (attack, decay, sensitivity ♡, Q).
Layout found on Sabrotone (cheers).
Real sweet and candylike.
I loooove Light Dependant Resistors!
Boxed with Super Mario stickers…
And heres the video:
I built three of these.
First one for testing,
Second is the v2, buffered with blend mod version, pictured here with the third one, straight v2 clone unmodded.
This is an autowah like filter for bass and guitar. Built #2 for my bass player, Dr. Pete.
Very nice pedal, low parts count but hard to mix n match the right transistors..