The early versions were finished in the familiar black and red paint scheme, but variations in the printing eventually resulted in what are now referred to as Reverse Logo Muffs. Some were printed entirely in red with no black, while others had red printed over black, creating a rusted brown appearance. A few were even finished in blue and red.
Another notable change during this period was the use of 2N5088 transistors, which became common in these circuits.
What makes these versions especially interesting is how they seem to combine characteristics from several earlier eras. They have some of the grit of the 1974 Ram's Heads, the full and balanced character of the early Ram's Head versions, the gain of the 1972 Triangles, and the strong harmonics and sustain of the 1976 pedals.
Despite sharing characteristics with these earlier circuits, the Reverse Logo Big Muffs have a voice distinctly their own, with thick, heavily saturated chords and searing lead tones with incredible sustain.