Increasing the value of the resistor will lower the gain, and lower treble content of the pedal. It also forms a filter that will allow some frequencies to go in or not. The input resistor (R1) and capacitor (C1) defines how much signal enters the pedal, ie the overall gain of the unit. Here are other easy mods and tweaks that can give a nice touch to a Big Muff: Read my post about the B ig Muff tonestack for more infos about how the tonestack works and what mods you can do. I found two of these loops in my Muff (note: more can be there try for yourself!) Can sound quite nice and interesting!!!!! The mod is done with a feedback loop: connecting two points together and letting signal flow back. It will give the Muff a weird drone note that will interact with the notes played resulting in octaves (up and down), nintendo sounds or a huge MUSH. I like to have quite a lot of output volume, so I prefer to use high hfe transistor for the last stage, like 2n5089, or MPSA18.įeedback mod This mod is also not for anyone. The last transistor will define the final output volume of the unit.The two transistors of the gain stages play a bit more with compression.2n3904/BC549C: great for a low gain Muff.MPSA18: extreme gain! I would suggest to increase emitter resistor to limit gain (especially for noise issues), but you can have a nice "doomy" muff with it!.Beware: polarity is reversed compared to 2n5089. 2n2222A: low gain, gives more bass and smoother sound. 2n5088: nice sound, gainy unit, but less noisy and agressive trebles than 2n5089.2n5089: high gain, but also gives a "gritty" touch to the muff that I do not really like.Higher hfe = more gain, but also more trebles. The first transistor is the one that will define the most of the gain of your unit.Note from Coda Effects: I also experimented with a few transistors, here is my feedback about this: Here is an example with silicon diodes and LEDs : You can also use switches to change the diodes. In my Dolmen Fuzz, I removed all the diodes with the central position of the switch: massive spurry sound!Ī good way to see what is your favorite combination is to use sockets for the diodes. Result: more volume (LOUD!), less compression, less gain and a more open (overdrive) sound. Remove the two pairs of diodes: great trick! By removing the diodes from the unit now sound if fed back.Remove the first pair of diodes, and you have got a Colorsound Supa Tonebender! The unit will be louder, with more bass, but still quite compressed.Sound is similar to silicon diodes, a bit smoother. FET / MOSFET: if you tie together the drain and gate of FET / MOSFET transistors, they will behave like diodes.Note from Coda Effects: I tried it on this Big Muff variant, I really like it! It gives a lot of dynamics to the muff. It gives to the Big Muff a nice "overdrive" feel, with a bit more dynamics. There will be less gain, less compression and also more volume output. Red diodes clip more the signal compared to yellow, blue ones.
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