Something I have never found with any other Sovtek based Big Muff circuit. This pedal is almost completely silent, even at maximum gain. Another interesting effect, I assume caused by the tone section mods, is that when the guitar volume is turned down, the distortion gates and sputters, something like a dying battery in a fuzz pedal.Įven though SMD components get a bad rap in the DIY builder community, it appears the small component size and tight circuit tracks in the Behringer offer noise benefits over larger, old fashioned thru-hole components. R5 is a 100k resistor, instead of the common 22k high pass resistor, with a huge 2.2M resistor added at R27, creating a boosted mid range. The low pass functions the same, but the high pass pathways have been modified, removing most of the boomy bass, and some of the trademark Big Muff sound. The component values are very similar to the black Russian BMP, but the tone stage is different. Smooth, but with the heavy low end removed by the modified tone section. The sound is more on the kinder, gentler side than the Russian circuits. Despite the look and name, the circuit was not a clone of a V2 or V3 era BMP, but was based on the Electro-Harmonix small box, black Russian Sovtek Big Muff circuit. VINTAGE DISTORTION modified Sovtek Big Muff - Behringer came out with a visually blatant, China made knockoff of the BMP in 2005, called the VD-1 Vintage Distortion. I have also tried to keep the part numbers consistent from schematic to schematic. To keep it from being confusing for those reading their PCB's, since this is primarily a reference for vintage Big Muff owners, and to keep the EH tradition, we have used this order on all Big Muff schematics, including post 1980's Big Muffs and clones. This is due to the fact that they are printed in this order on the actial V1, V2, and V3 Big Muff PCB's. WHY ARE THE TRANSISTORS LABELED IN THE REVERSE ORDER? - Note that Q1-Q4 and D1-D4 are labeled in reverse order from input to output on these schematics than they are on a typical schematic. Evolution of the Big Muff Pi Circuit - Part 4 - 2005 to Present
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