It is more likely that 500pF caps were simply not available, so the factory opted for series caps equating to that value. The reason for this could have been simply due to the factory having a surplus of 1nF caps, but there were several cap types used through the years, indicating that was not the reason. Using the caps in series is a strange oddity for the Russian Big Muffs. First editions had 430pF caps, but later changed to 0.5nF/500pF (two 1nF caps in series) for the second edition. Two versions of the circuit were made, shown below, but the only difference was the feedback/filter capacitors at R9, C11, and C12. 047♟ clipping caps at C6 and C7 (usually 1♟) gave these a fat, thunderous bottom end. It was given larger value 390Ω emitter resistors (rather than typical 100-150Ω) for a lower gain sound, and a slightly less mid scooped tone stack. The circuit did not follow the schematic of any previous version, but rather was a reinvented set of component values, giving it a whole new twist on the tone. The same pedal was branded as both the Big Muff Pi and as the Red Army Overdrive, sold simultaneously. The RED ARMY OVERDRIVE and Version 7 "CIVIL WAR" BIG MUFF PI - After several years of being out of production, around 1991 Electro-Harmonix returned to the market with the Russian made Sovtek Big Muffs. VERSION 7 SOVTEK BIG MUFF PI - 3 circuit variants exist, each made in extended manufacturing runs. I have written more about Maxon and the Maxon/Ibanez Big Muff clones here. The Ibanez 60's Fuzz Soundtank SF5 and FZ5 were also variations of this circuit.
#BK BUTLER REAL TUBE II DRIVER#
Maxon used the same pcbs in a variety of different enclosures, marketed as the Maxon OD-801, Maxon MD-9, Maxon Jet Driver JD-01, Maxon Magnum Distortion MD-9, Ibanez Double Sound (second version), Ibanez Overdrive OD-9. Minor changes were made to the circuit for the next several years.
#BK BUTLER REAL TUBE II MOD#
This one is an exact clone of a 1973 "violet" era Ram's Head Big Muff variant, with the exception of one slight pathway mod in the tone section.
Looking at just the BMP section of this circuit you will find it is different from the '74 circuit. This is a trace of my square button version, circa 1979-80, with the FET bypass switching section removed.
#BK BUTLER REAL TUBE II UPDATE#
MAXON D&S / IBANEZ OVERDRIVE Second Series, modified Violet Ram's Head Big Muff - An update to Maxon's mid 1970's OD-801 Big Muff clone (shown on page 1), also sold in an Ibanez branded version, the OD-850.
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 3 - 1980 to 2005
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