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)
Vox Tone Bender clone, with tone cap switch and boost/cut switch.
I did some research on this one, so many different variations.
Heres some of the stuff i found out
-the famed 47k resistor across the level pot makes the sound ‘less there’, not useful AT ALL- i dumped it;
-it makes sense to have a 3n3 AND 10n on a switch, with the 10n(2) cap you go steady into classic bender territory, otherwise you have a very trebly bender here (which i prefer in this case actually!);
-biasing is a breeze. Just pick carefully the q1 tranny. I auditioned quite a few. I found comfy with a ac134, 138 hfe on q1; i picked an ancient oc76, hfe 33 for q2.
But remember, q2 here follows q1. If q1 sounds good, q2 is there just to give it some body and tails (sustain);
-1k, attack (fuzz) pot only works either full on or at the final 3/4 of its run;
-22uF is a good value for the electrolytic, giving the pedal a good sustain and range.
Fiddlin with the trannies, i stumbled upon a setting where it sounded a lot like the fuzz on Easter Everywhere by the 13th fl elevators.. im talking about the guitar at the beginning of the second song.. sitary and choking, maybe due to misbiasing, a really haunting tone, gotta go back there somehow in the near future.
Ducati filering cap, a salvo to the original vox made in italy, 15uF of the motorcycles brand; icel and sifco nos caps, and a nos mustard cap that i believe its italian too.
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
My friend Stef of Space Pony is an avid collector of italian musical instruments and devices.. hes been waiting for a Repeat Percussion forever.. and hes been lusting after a jen tonebender as of lately.
It’s been on my mind for a while to make a psychedelic toolbox pedal, ahah, with all that a 60es loving trippy musician would need.. but i have never made multi fx boxes.. i decided to box two effects in one for Stefano.
And it was working first off!
‘A metal slice of gruviere’ as the date called it..
I only had a small 1590… goddamit my hands are so big its always a pain to work with these boxes..
To the left: vox/jen germanium tonebender, using q1, ac183 and q2, ac181 npn germanium. Very nice ♥.
To the right, the repeat percussion.
I had a cute multi colour led that flashed when youd switch the repeat percussion on but it caused all manners of noises.. replaced it with a blue led.
IT IS PSYCHE IN A BOX.
So..on to the artwork.
I used two nos italian decals from the 60es.
Had to make a smaller unit.. this is really tiny (it would fit in one of those hook it up on yer guitar boxes it originally came in).