I was wondering is it possible to run 2 different power supplies within the one effect pedal. With one supply being
+15V -15V from a 9VDC source through a charge pump. With the second power requirement for a second part of the circuit isolated from first part also powered from same 9VDC source, only this section powered as +9v and 0V GND with bias for op amps.??? If this is possible, I were hoping some kind people here could please advise me on how to achieve as much, even a pictorial basic...

Hello

I have been looking for a schematic for the ADA MP1 channel pedal, but no luck. This is the tube pedal. I looked at the VAULT ( and contacted MarshallJMP who sells parts for the old ADA devices.

I also looked to purchase one the pedals, but I do not see them for sale.

Please let me know if you have a schematic you could share, or maybe someone that has one and would be willing to take pictures.

Thanks
Rob

I couldn't find a schematic, sound files or any great gut shots of this one...There's some decent pics at:

Anyway, lemme know if this has already been traced or if there's any schemes or sound files out there.
If not, I'll open it up shortly.

I can tell you it's sounds like it's a Fuzz Rite topology. It blends a fuzz into a clean signal the exact same way.
The big difference is that the clean is louder, bassier (almost muddy) and a bit more distorted and at full ( increase ),
there's still...

This one:

which is this one:

Nope. A R5101 Reticon is not suitable for a new project. They're more rare than Pygmee foreskin leather. But since I have one of these with a (thoroughly) confirmed dead Reticon a rework for a PT2399 is in the make. Not analog anymore but still with the same heavy filtering which will then be called analog voiced :blackeye

Hello, I recently made a copy of it following old analogguru schematic:

but the result is really poor comparing to the original sound found on youtube...
1 thing, schematic have a square wave LFO, and clearly on records the sound is made with a triangular wave FLO. Anyone had the chance to serve one and trace it?
Regards
Benoit
PS: web archive have all the original analogguru schematics if someone is interested

Old and Rare.
Some parts are not known but I have worked out good estimates.
The filters (C6 and C8) were matched by using the sound samples.

Yack YF-2 Fuzz
Japan
1967 to 1969

good pics:

Sound sample from electricpartslibrary page: (if this link doesn't work go via previous page)

v good pics:

Comments, additions, fixes welcomed.
Yack YF-2 Fuzz Box V1.0.png

I'm reposting this regarding Madbean's Harbinger 1.5 / Univibe:
I've been playing around with the various pots and trimpots and to my *imperfect* ears, in the vibrato mode, the amount the pitch is modulated is, let's say, a semitone. So, the signal warbles up and down a semitone and it seems that the Intensity knob attenuates the amount that the semitone warble is heard, but it doesn't change the amount that the pitch changes, if that makes sense. Adjusting the internal trimpots, to my ears,...

hello, i got some time so i'm back with the pedals and recently i got some 12ax7 and a little bit bored with silicon, i started building preamps of recognized amps, i built the preamp of a jcm800 and all good, so now i want to build the jcm900 preamp, but I have a doubt about the signal input and the behavior/function of the marked line, I hope that someone who has some experience in this can help me

I thought this might be of interest. It's a kind of modulated doubling delay.
This particular unit is quite distressed. I've traced it to help debug it.
Switching and power are not shown. It has it's own plug, and i couldn't be bothered to follow the wires around a transformer and bridge rectifier etc. There's a couple of regulators for +15V and -12V.
I'm not very experienced with this stuff, so please take it all with a grain of salt.

It seems like a previous owner tried some...

halifax treble booster 5.jpeg
hallifax treble booster 02 guts.jpeg
halifax treble booster - transistor.jpeg
hallifax treble booster guts 3.jpeg
hallifax treble booster 2.jpeg

hallifax treble booster guts .jpeg

I need to replace the potentiometer on a Ross Phase R1 (Purple).
The potentiometer is utterly destroyed.
There is absolutely no resistance reading between the outer pins and the CTS potentiometer is not marked for value.

It seems someone put brakefluid in the potentiometer which in turn ate up the carbon track completely.

If someone has a purple Ross Phase R1, I would really appreciate it if you could
1) just measure the resistance between the outer potentiometer pins for the two cases of...