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Catalinbread’s Formula 51 overdrive pedal captures the spirit and feel of one of guitar history’s most iconic tweed-covered combo amps — all the way down to the sag of the original! In fact, the Formula 51 packs a true output transformer, preamp, and phase inverter into its modestly sized box to better replicate the organic feel and volume-knob sensitivity that made its amplifier inspiration so legendary. While the original amp had but a single knob to shape your tone, Catalinbread decked out the Formula 51 with Volume, Gain, and Tone controls, in addition to a Sag knob that pushes the output transformer to achieve the classic compressed, raw tone of a hard-pushed tube combo. From a slight mid-forward grit to edge-of-implosion blown-out dirt tones, Catalinbread’s Formula 51 overdrive pedal faithfully replicates — and even enhances — the small-box amplifier tone that’s graced countless classic records.

Captures the tube-powered overdrive magic of a legendary ’50s 1 x 8-inch combo amplifier

Includes a preamp, a phase inverter, and an output transformer for a true amp-like playing experience that reacts to your playing dynamics

Sag control loads down the transformer to produce the beloved “blown-out” sound of a hard-pushed ’50s amplifier

Volume, Gain, and Tone controls offer significantly more tonal control than the original amp’s single volume knob

Tone knob incorporates the mid-scoop control of another famous amplifier, ensuring ’50s-, ’60s-, and ’70s-style tones

Can be run at 18 volts for greater headroom

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