FuzzHugger Algal Bloom Modified 4k

The FuzzHugger Algal Bloom Modified 4k is a compact fuzz pedal that takes the Algal Bloom Modified circuit and pares it down to four controls, focusing, as FuzzHugger puts it, on "the circuit's thick high-gain fuzz tones"¹. It sits in the family tree alongside the full Algal Bloom Modified and the Algal Bloom 4k, sharing the same lineage: FuzzHugger describes that circuit as starting with "FuzzHugger's classic chord-friendly, overdriven fuzz" and enhancing its best qualities²³⁴.

The pedal is currently listed as Out of Stock on FuzzHugger's site, at a list price of $149.00⁵. FuzzHugger covers it with what the maker calls an "Endless, transferrable warranty, free parts and labor on repairs"⁵.

The controls: Headroom, Bias, Voltage and Level

The Modified 4k keeps four knobs, each doing a distinct job in the circuit. FuzzHugger's own descriptions of what they do¹⁵:

The Voltage knob is the star for players who like the "dying battery" sound: it is a built-in voltage sag control, so you can starve the circuit down to a few volts without actually feeding it less from the supply. The Headroom control works at the opposite end of the equation, backing off the clipping for a clearer, more open drive⁵⁶¹.

One thing to know before you twist knobs mid-riff: the Bias knob is noisy. FuzzHugger is upfront about this on every version of the pedal, stating that it "Scratches when adjusted"¹. The same note appears on the full Algal Bloom Modified and the standard Algal Bloom, where the maker writes that Bias "Sets your overall hotness and thickness, from lower gain to higher gain than ever before"⁷. It is a trait of the circuit, not a defect in a particular unit, so set it between songs rather than during one.

Power: 9V to 18V, no battery

The Modified 4k requires a 9V to 18V DC center-negative adapter, which is not included, and it takes no batteries at all⁵. That has two practical consequences for a pedalboard: you need a free 9V output (center-negative, the standard on most supplies) from the start, and there is no battery fallback if power is unavailable. The wide 9V to 18V input range means it can also run at higher voltage for more headroom, and the Voltage knob then lets you dial that back down from inside the pedal⁵.

Versions and finishes of the Algal Bloom

FuzzHugger builds the Algal Bloom family in small runs with a rotating set of finishes, and the Modified 4k has appeared in several configurations⁸⁵:

• A graphic deluxe-finish version at a sale price of $148.00, offered as a cosmetic sale with a minor clear coat imperfection¹
• A horizontal burlap deluxe-finish version at a sale price of $142.00, also a cosmetic sale, with a few very minor inconsistencies in the clear coat and slight waviness at the clear coat edges in a couple spots⁸
• A prototype graphic version with no added finish, listed at $149.00⁵

The standard finish treatment across the range is what FuzzHugger calls a "Deluxe thick acrylic finish"⁵, and one-of-a-kind burlap versions of the Algal Bloom Modified carry "a special 5-layer finish, with lovely depth and colors" and silver knob labels⁴. The 4k versions also get silver knob labels⁶.

The Modified 4k's 2.7 x 3.7 aluminum enclosure⁵ is the small box in the family. The full Algal Bloom Modified uses a larger 3.7 x 4.7 enclosure⁹, which is what you would expect given its bigger control set.

The 4k and the full Modified compared

The difference between the Modified 4k and the full Algal Bloom Modified is mostly how much of the circuit's control set you get. The Modified 4k carries four knobs: Headroom, Bias, Voltage and Level⁵. The full Algal Bloom Modified carries the fuller set, which on FuzzHugger's 2-in-1 pairing is listed for the Algal Bloom Modified side as Highs, Thick, Push, Voltage, Gain and Level¹⁰, and it uses the larger 3.7 x 4.7 enclosure¹⁰⁹.

On the sound side, FuzzHugger describes the 4k-generation circuit as letting you "Dial in more gain and thickness than ever before," with a slightly higher-fi character, lower overall noise levels and a touch more sustain⁶. The same pages note the Push knob found on fuller versions "boosts, adding gain, sustain, and brightness," behaving more aggressively at higher-gain settings and more subtly at lower ones¹¹, and that the Thick knob lets you push the bias further in either direction¹⁰. The 4k folds those functions into its Bias and Headroom controls rather than giving each its own knob.

Where it sits in the Algal Bloom family

The family tree, as FuzzHugger's pages describe it: the Algal Bloom is the original "chord-friendly, overdriven fuzz"⁴. The Algal Bloom Modified starts with that circuit and enhances its best qualities¹². The Algal Bloom 4k is a variant of the Modified², and the Modified 4k is the four-knob, small-box take on it⁵. From there the range branches into 2-in-1 pairings such as the Custom 2-in-1 Algal Bloom + Algal Bloom and the Algal Bloom & Blend, which adds a clean blend and a seven-knob control set of Highs, Thick, Push, Voltage, Head, Gain Fuzz Level and Clean Level.

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