EARTHQUAKER DEVICES: Spires Green Channel

The Earthquaker Devices Spires green channel is a variation of one of my favourite fuzz circuits - the Rosac Nufuzz.   It's a progression of a fuzzrite from the original designer, but it has a tone control on the output sweeping between a small and large cap to provide a thin to thick fuzz sound.  There's no fuzz control, it's set to full all the time.

I used an old layout from the D*A*M FR-70 to adapt for this, as it's almost the same.   I skipped the 10k resistor on the input for this reason.  Could always squeeze one in if you wanted it.

Schematic located here on Pedal PCB  and if you're wondering about the other channel on Spires (the red one), it's a silicon fuzz face.  It probably has some tweaks, but you get the idea.  

EARTHQUAKER DEVICES SPIRES GREEN CHANNEL - 0.15" VERO LAYOUT

EARTHQUAKER DEVICES SPIRES DEMO

ROSAC: Nu-Fuzz

The Rosac Nu-Fuzz is an Ed Sanner design, of Mosrite Fuzzrite fame - the Nu-Fuzz is an evolution of the Fuzzrite.  

Key differences to a Fuzzrite:  both sides of the tone (or depth on a fuzzrite) pot are taken from the same transistor, and are subsequently in phase, with the same amount of fuzz on each.

A Fuzzrite mixes signal from each transistor together at the depth pot - so one is cleaner than the other signal, and they're out of phase.

ROSAC NU-FUZZ - VERO LAYOUT

Nearest regular resistor values are used for the layout.

SCHEMATIC & LTSPICE ANALYSIS

The Rosac Nu-Fuzz is an Ed Sanner design, of Mosrite fame, so there's an element of Fuzzrite happening with the Nu-Fuzz.  The Nu-Fuzz was released after the Fuzzrite.

ROSAC NU-FUZZ - POINT TO POINT LAYOUT

There's some odd resistor values used, just try the nearest match that you can find, and maybe experiment a little.  You could increase the 10uf cap to something much larger and add some filtering via the usual 100ohm / 100uf RC filter combo.  Like anything of this vintage, batteries were the go to power supply.