![]() Of course you can try other diodes, like 1N4007 or Schottky diodes. 1N34A are germanium diodes, they will sound much warmer, more “vintage”, but less precise and accurate. changing D2 & D3 with 1N4148 will bring more headroom, a little bit warmer tone overall but still something pretty close to the LEDs. LEDs (like on the stock ODB-3) bring some kind of smooth, natural clipping but still pretty agressive. that’s a good way to design an overdrive, and the diodes play an important role in the final tone as they actually “create” the clipping. The D2 and D3 diodes are clipping diodes, they force the signal to clip with a relatively low actual gain. after you changed those components, you just have to close the pedal and go try it. When the pedal is open, here is where to find those components :īoss-ODB-3-Bass-Overdrive-Schematic copy2 1920×589 122 KBĪnd that’s it. D2 & D3 : optionnal tweaks (more about this later).C10 : replace with a 1μF or 2.2μF non-polarized capacitor (original value : 33nF =.R31 : replace with a 1k resistor (original value : 3.3k).The mod is very simple, of course it requires a soldering iron and the matching skills, but there are only a few components to change : Overall, with my gear (Precision Bass / SVT-VR model) it makes me think about some kind of vintage version of the Darkglass tone. sounds fuzzy (not necessarily in a good way) when the gain is cranked up.the EQ has too much amplitude considering the tiny knobs size, in my opinion.the pedal remains very sensitive to the PSU quality it sounds good with a battery and a good quality PSU, but it’s very likely to bring some “hiss” and other PSU noises.can be tweaked with the diodes option (more about this later in this post).the overdriven signal blends way better with the original tone than the original.very transparent, doesn’t really add any color (except with the 2-band EQ if you want), just a transparent gain that is added to your bass tone.Here is a quick sum up of what you will obtain with this pedal, after doing the mod : So I want to be very clear about the fact that, despite my tests, I’m not the inventor of this mod I only explain and comment an existing mod. I tried various things but I ended up with this common mod, simply because it works well. There is a common mod on the internet for this pedal. Plus it’s noisy as hell (I assume hell must be noisy). It sounds tiny, like an overdub of a thin tiny treebly layer stacked over the clean tone. In my opinion, the biggest problem with this overdrive is that … it’s not an overdrive. This the only Boss overdrive pedal, and it seems everybody is ok to say that it’s not a good one. ![]()
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