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Had a quick look inside this one the other evening.
Light wasn't great for photos and I didn't do a full tracing.

Components match VERSION 9 NYC REISSUE BIG MUFF PI . First version with 3003 PCB. NPN transistors
on this page

Most of the component references match up with the Kit Rae schematic too.
Resistors are SMD.
All caps are full size, no SMD caps.
All transistors are full size 2N5088.
Clipping diodes are 1N6263
All pots are B100k.

Voice switch
============
Switches the C9 capacitor...

This vintage octave-up/ring modulator showed up on Reverb for just a few days. Here are the seller's pics if anyone wants to trace it. The only adjustments are two trim pots. The instructions are posted on Effects Database and are included here for continuity. Apparently Thurlby is still in business in the UK, as Aim-TTi (Thurlby Thandar Instruments) which manufactures test equipment and power supplies.

Thurlby front.png
Thurlby angle.png
Thurlby jacks.png
Thurlby back.png
Thurlby...

Hi all!

I searched for it but no dedicated post was made on this effect pedal. There is one on the 'Probe series' but all probe pedals are discussed there.

I got one in for some TLC and to add a LED. The owner makes a lot of nice noise music but in the wash of his playing he couldn't hear if the pedal was on or off. I added an LED to the pedal (and a DC jack / he just cut a hole in the side to get a wire in)

You can find pics and a schematic in my blog; check the link in my sig.

I traced...

Reprinted in Guitar Player magazine circa 1971, from Electronics World Magazine January 1971. MultiTone.pdf
MultiTone1.png
MultiTone2.png

Kamadude1216 and I traced this over at the PedalPCB forum , but figured we'd share it here, too. So, bottom line upfront, here's the schematic:

With that said, let's start off with the gutshot (behind the spoiler).

As you can see, it's built on copperless perfboard with lots of offboard wiring. Everything is gooped with a soft black rubber that was easily removed.

Here's what's underneath the rubber once it's removed:

Unsurprisingly, it's quite similar to the Paul Trombetta...

Hello everyone
I built a tonebender mkii, after some transistor choices I have the following parameter.
the sound is not bad, but there is doubt about the lack of leakage in Q1. Is the resistor sufficient?
trimpot Q2 and Q3

9.88v
HFE/Lk (DC55) C B E
Q1 AC128 - 65/0.036mA 8,00
Q2 NKT72u - 76/0.063mA 0.47 0.11
Q3 2N1309 -242/0.403mA 8.04 0.46 0.38

I put a 2m2 resistor Q1 collector base

I've never had a mkii in my hands, so I don't know if it's looking good.
Any tips?
thanks

I had one of these for a while, serial # 011 from 2009, and decided to trace it. I got far enough to realize it was looking a lot like a Big Muff, so I spot-checked the rest, and indeed it is. Starting from a stock Triangle BMP schematic, you can make these changes to get a Yeti:
Q1 - Q4 = BC239C
Add the AMZ Presence (mids) mod, except it's a 4-position switch instead of a pot, with the 4th position bypassing the Tone pot
Sustain pot is A100k instead of B100k
DC filter cap is 220uF...

I made some inroads towards tracing the PS-001 Distortion.

Turns out it is more than an MXR Distortion+ with a Muff tone control. Structurally it's more like a Boss DS-1.
(Given the similarity of the Guyatone PS-005 Overdrive to the Boss OD-1 it's not surprising there is some similarity to the Boss DS-1.)

Unfortunately there's some ambiguity regarding the tone control caps. (The two polyester caps on the middle-edge of the PCB where the wires are).

Enclosure:
guyatone PS-001 distortion -...

Guyatone made a large number of pedals by there's surprisingly few schematics.

I started off looking at the Guyatone PS-001 Distortion but there's not a lot of PCB pics out there.

In the process I found some info on the sister pedal Guyatone PS-005 Overdrive. At times people have tried to guess what this one is as well

I managed to trace the structure of the circuit. It looks like a Boss OD-1 (ish) circuit with a Muff Tone control. Unfortunately no values.
guyatone PS-005 overdrive -...

I got this fuzz as I wanted to try another Germanium Fuzz Face sound.

It is a great fuzz face like pedal with germanium NPN transistors (MP38A)

I traced the pedal:
ZCAT - Cat fuzz.jpg

More info and pics on my blog; in my sig is the link

Hi. After all, sorry for my English.

Is anybody interested in tracing the Aguilar Octomizer?
I have one a long time ago, and tried to trace it myself, but don't have the time and knowledge to do it.
I degooped the little secret part of the PCB, but I'm afraid I scratched too much and deleted the marking on an IC. And there is a smd diode broken too, that I think it's a dual smd diode, kind of 1n4148.
I can messure any resistor or capacitor, or desolder too.
Here it's a shared folder with...

Built RG Keen's Lera from Geofex to add to a PedalPCB clone of the Walrus Julia.

The On/Off switch works and the Lera does affect the sound of the Julia by adding a warble. The speed is quite fast. Neither the ramp up/down switch, the instant/delayed switch, nor any of the three trimpots have any effect on the sound.

I added the optional 10uF capacitor to the output of the 78L05 but no difference to the sound.

The build doc says Once you get it wired up, check it out with a...

Hi. Does anyone have quilter phantom block circuit?

Germanium Fuzz Machine

The designed effect is modeled on the classic Fuzz Face. I used SFT322 germanium transistors (NOS). They have lower gain than AC128/2N404, which gives us a much lower level of distortion. Perfect for rock 'n' roll songs.

The Fuzz has a 125B style housing, crocodile skin paint coating, anodized aluminum faceplate, and laser engraved inscriptions.

Instead of the standard linear FUZZ adjustment potentiometer, I used the Rev-Log potentiometer. We can adjust the gain more...

I have a 1980 long dash Boss OD-1 with the 4558. But I have a few issues with the pedal...I think. For one, the pedal doesn't work on a battery, yet the jack doesn't seem to be shunted. The LED never illuminates, even momentarily, yet the LED is tested and working fine. Also, the pedal just doesn't sound right to me. I've never played an OD-1 before, but it seems very dark and muddy with humbuckers. The 2nd half of the overdrive knob seems to not affect the sound at all, at least to what I'm...

I bought a used Way Huge Supa-Puss pedal with a broken Feedback control. It looks like a 9mm D-shaft potentiometer, but you push on the shaft to cycle through the different beat subdivisions. It is labeled 2F4. On the main PCB, it is labeled RP5.

Someone mentioned to me that it could be an encoder, but I have no idea. Does anyone know what the specific part/value is?

Hello everyone.

I've traced the 'Mountain Range' side of the Fuck Mountain by SS/BS. According to marketing this is the SS/BS Mountain Range circuit. The Mini/Fuck side is already out there.

It's an interesting if not rather simple circuit. I'd have done things differently for sure. That output cap could cause switch popping. You could replace it with a 100n and the new cut off frequency would not be a perceptible change.

I have not dismantled the unit as it isn't mine. Due to this; all pot...

Traced schematic and photos

EHX_RamsHeadReissue_Schem_GBisson.png

RamsHead_01.jpg

RamsHead_02.jpg

I got this pedal pretty cheap. No, it is not a fuzz pedal.....

It is a Red Fuzz clone (Robin Tomtlund). General Guitar Gadgets has a great page on this pedal.

Aural Dream - Purely Fuzz.JPG

Check my blog for more info and pics on the pedal. Links are in my sig

This mod converts the Joyo JF-16 British Sound to true bypass and replaces the MOSFET transistor in Q1 in the buffer to a JFET to reduce the noise, which is quite noticable at high-gain settings.

My pedal stopped working due to the wires that connect the switch to the main pcb failing, so I had to intervene. In the process of replacing the wires I applied also this mods.

To make the true bypass mod work you need to cut the pcb trace that connect the input jack to the buffer.

These are...

Hello everyone. I'd like to know if someone has a mod to reduce the ramp speed on a danelectro big spender. I've been looking for a mod and the schematic but have found nothing. I really like this pedal. The only thing that bothers me a little is the ramp speed. It takes 10 seconds to ramp up and down. I think it's excessive and it is not useable. I want to reduce it to 4-5 seconds, but since i know nothing about modding, i have no idea what to do. I dont know if i have to change a cap, or a...

About ten years ago I traced the circuit of the Hughes & Kettner Metal Master.
The capacitor and the resistor in the red-framed ellipse were missing in the original schematic.
The transistors of the power amplifier were specified with the BC23x instead of the BD23c types.
Further additions in red font.

Meta lMaster corrected schematic.jpg

A single pot tilt style EQ for bass.
See links for more info.

Schematic:
Westone Thunder 1-A - Active Tone Bass Preamp (V11) - sch.png

Frequency Response: (Active Tone min, centered, max)
Westone Thunder 1-A - Active Tone Bass Preamp (V10) - response.png

Wiring:
WestoneThunder1ABasswiring - rich2021_bass_chat.jpg

Parts Designations: (see thread in links)
Fixed two R16's
Westone Thunder 1-A - Active Tone - Designators (fixed).jpg

Links

Debug Thread With PCB Pics and Parts:...