Strymon - Fairfax - Class A Output Stage Drive

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.

Killer code only sounds killer when it’s hosted inside of an ideal analog environment, and even though we’re primarily known for our DSP prowess, our stuff wouldn’t sound the way that it does without our strong analog team.

The analog guys are always coming up with interesting designs, so we’ve launched the ‘Series A’ line of pure analog pedals to give them an outlet, with Fairfax being the first in the line. 

The designs you’ll be seeing in ‘Series A’ are intended to offer something different from traditional Strymon offerings, with no MIDI, USB, firmware or digital processing. These will be pedals that are unabashedly analog, which means it could get really interesting! Keep an eye out for more ‘Series A’ pedals as we go forward.