Fairfax began as an engineering experiment, initially inspired by the original Garnet Amplifiers Herzog® tube drive unit designed for Randy Bachman in 1965. Our analog guys decided to try and recreate all of the critical elements of a custom Champ-like tube amp circuit fully in the analog domain, but small enough to fit into a pedal enclosure (so it couldn’t use real tubes or an output transformer). 

The final design features a cleverly miniaturized tube preamp, Class A power amp and an ingenious custom circuit that emulates the saturation characteristics of the output transformer (which is absolutely vital to get the sound right).

There’s even a variable Sag circuit that behaves just like a real tube amp does. At low Sag values the behavior is mild and only slightly compressed, and at max values the JFETs can go crazy and unbias — which gates the signal — leading to spitting and chortling sounds more commonly associated with fuzzes.

In order for Fairfax to behave like a real amplifier it needed a massive amount of operating voltage, so a transformer-based power supply converts the 9VDC input voltage to 40V internally. This gives Fairfax the power that it needs for high headroom and amp-like feel, allowing for a wide range of tones. 

At lower Gain settings Fairfax can be sweet, gently pushing the input to your amp with additional harmonic richness, a touch of saturation and a flat frequency response. At higher Gain levels the sound becomes fully saturated, and that large range of gain on tap allows Fairfax to be used in nearly any setup imaginable.

Features

• Complete tube amp circuit fully recreated in 100% analog.
• Custom analog circuits recreate multiple tube stages and the critical output transformer.
• Input voltage converted to 40V internally via galvanically isolated power supply.
• Controls for Drive, Level and a variable Sag control.
• Bright switch allows fine-tuning of the high frequency response.
• Wide range of natural sounding and tube amp-like gain for maximum versatility.
• Sag circuit allows mild Sag effects at lower settings and spitting and gated sounds at max.

Specs

• Fully analog circuit.
• True Bypass.
• Mono in/out.
• Dimensions: 4.53″ deep x 2.83″ wide x 2.33″ tall (11.51 cm x 7.19 cm x 5.92 cm)
• Power requirements — maximum 9 volts DC center-negative, with a minimum of 500mA (power supply NOT included.)