The 3-Series Fuzz represents something Josh Scott has spent years perfecting—a circuit that synthesizes decades of classic fuzzface modifications into a single, accessible build. It's not rocket science, and Scott isn't concerned about protecting this as proprietary knowledge. But for anyone interested in building their own boutique pedal, this episode offers a comprehensive walkthrough of what makes the 3-Series Fuzz unique.
The Core Topology
The fuzzface circuit centers on two transistor stages. Stage one feeds into stage two, with a feedback loop connecting the base to the emitter—a design that defines how classic fuzzes produce their characteristic tone. The fuzz control sits on the emitter of Q2, and this topology remains remarkably consistent across virtually every pedal using this architecture.
Scott emphasizes that NPN (silicon) transistors are the standard configuration, though PNP (germanium) alternatives exist. The choice between silicon and germanium isn't a strict rule, but it's become an unspoken convention in the fuzzface world.
The circuit has been traced back to various historical sources—the Vox 816, the Tone Bender 1.5, and mid-1960s fuzz faces—though exactly who first invented this sequence of components remains debated among historians.
What Makes the 3-Series Different
Three modifications distinguish this build from a stock fuzzface:
External Bias Control: This provides an external adjustment for the potential gain on Q2. When you turn it, you're directly altering the ladder of potential—a control that dramatically changes how the circuit behaves.
"The fuzz control is always down here on the emitter of Q2."
Fat Toggle: This modification changes the coupling input capacitor value by adding a parallel capacitor. The math produces different bass and treble frequencies, fundamentally altering the tonal character. It's an easy mod that works on any similar circuit—you'd simply adjust values to taste.
Pre-Gain Control: In the 3-Series Fuzz, there's no traditional fuzz knob. Instead, a 1K resistor fixes the gain at maximum—meaning the fuzz is always fully engaged. The pre-gain control functions more like a volume knob on your guitar, giving you clean boost to drive the fuzz section harder.
The Clean Boost
A crucial addition sits at the output: a common emitter gain circuit using the same transistor choice as a clean boost. This addresses a fundamental problem with vintage fuzz faces—they tend to be quiet. By adding this clean boost stage, the pedal maintains adequate volume without requiring you to keep the knob turned fully up.
The design uses BC848 surface-mount equivalents, though any NPN transistor with reasonable hFE values (typically 100-150) works fine.
The Build Process
Scott walks through connecting power rails, establishing ground connections across the board, and preparing the input stage. The first component connects to a 250k pot for input control—connecting it to both the signal path and ground as you progress toward output stages.
The entire build requires approximately thirty minutes, though Scott promises not to rush too quickly through explanations.
Bottom Line
This episode succeeds because it synthesizes scattered modifications from previous installments into one coherent circuit. The strongest element is how clearly it connects these mods—bias control, fat toggle, pre-gain—to the underlying fuzzface topology that powers them all. Anyone building this pedal can apply the same logic to future projects.
The vulnerability lies in Scott's casual tone—some viewers may want more rigorous technical detail about component values and less conversational filler. For dedicated DIY builders, though, this represents exactly what's been missing: a single place where these mods are collected and explained.
The Core Topology
The fuzzface circuit centers on two transistor stages. Stage one feeds into stage two, with a feedback loop connecting the base to the emitter—a design that defines how classic fuzzes produce their characteristic tone. The fuzz control sits on the emitter of Q2, and this topology remains remarkably consistent across virtually every pedal using this architecture.
Josh emphasizes that NPN (silicon) transistors are the standard configuration, though PNP (germanium) alternatives exist. The choice between silicon and germanium isn't a strict rule, but it's become an unspoken convention in the fuzzface world.
The circuit has been traced back to various historical sources—the Vox 816, the Tone Bender 1.5, and mid-1960s fuzz faces—though exactly who first invented this sequence of components remains debated among historians.
What Makes the 3-Series Different
Three modifications distinguish this build from a stock fuzzface:
External Bias Control: This provides an external adjustment for the potential gain on Q2. When you turn it, you're directly altering the ladder of potential—a control that dramatically changes how the circuit behaves.
"The fuzz control is always down here on the emitter of Q2."
Fat Toggle: This modification changes the coupling input capacitor value by adding a parallel capacitor. The math produces different bass and treble frequencies, fundamentally altering the tonal character. It's an easy mod that works on any similar circuit—you'd simply adjust values to taste.
Pre-Gain Control: In the 3-Series Fuzz, there's no traditional fuzz knob. Instead, a 1K resistor fixes the gain at maximum—meaning the fuzz is always fully engaged. The pre-gain control functions more like a volume knob on your guitar, giving you clean boost to drive the fuzz section harder.
The Clean Boost
A crucial addition sits at the output: a common emitter gain circuit using the same transistor choice as a clean boost. This addresses a fundamental problem with vintage fuzz faces—they tend to be quiet. By adding this clean boost stage, the pedal maintains adequate volume without requiring you to keep the knob turned fully up.
The design uses BC848 surface-mount equivalents, though any NPN transistor with reasonable hFE values (typically 100-150) works fine.
The Build Process
Josh walks through connecting power rails, establishing ground connections across the board, and preparing the input stage. The first component connects to a 250k pot for input control—connecting it to both the signal path and ground as you progress toward output stages.
The entire build requires approximately thirty minutes, though he promises not to rush too quickly through explanations.