Tag Archives: mods

DOD FX55B SupraDistortion – BigBuff Mod

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Here’s another in a line now of DOD pedal mods. For this FX55B, I decided to go for more of a BigMuff sound. Playing around with this pedal initially, I found it to be like most mass-produced distortion/fuzz effects. It had a very thin sound and that notorious volume drop that you may have heard on a high-school band’s first album. The lows were almost non-existent when the effect was engaged. I found the following schematic and, with a few simple changes, came out with a distortion pedal with considerable gain, massive lows, and a smoother, more rounded square wave.

dodfx55b_bigbuff_mod

Overall, the idea here was to get more from the pedal by employing some germanium to smooth out the harshness and to increase the overall output. The output is now considerably higher as long as the tone knob is set closer to 10 o’clock. At noon, the mixing is practically useless. At the 4 o’clock position, you get more of a thin, trash punk type of sound with an excessive noise floor. The sound sample demonstrates the effect with the tone set at about 10:30-11 and first contrasts the distortion setting. The third set shows off the tone below 10 o’clock. The last set shows what the tone does when you sweep through it.

Boss Tremolo TR-2 w/ C4 Mod +Gain Boost


This little guy is currently on eBay. I always thought that this tremolo wasn’t bad, but the volume drop was insatiable and drove me nuts sometimes. I thought I would try modding this one by cutting out the C4 cap (a 0.1uF bypass cap) which is the alleged cause of the gain loss. It is, but not without good reason. It does keep the effect sounding smooth and really clean. Removing the cap also opens up those capped frequencies which some people report a more warm and/or harsh tremolo tone. I enjoyed the more dramatic effect of the pedal myself, and decided to make it even more so by substituting the 10k ohm resistor before the non-inverting terminal of the first opamp for a 4.7k. This added a nice volume boost which gives the tremolo more cut especially when combined with heavy reverb or a washy delay. We’ll see if anyone decides to buy it. I think it’s a huge upgrade from the original sound.