BIG AL’s frequency conditioning begins right in the EF9 preamp stage. Indeed, it is a filter freak at heart — hence the Low control being implemented as a Baxandall filter that allows for adjusting saturation intensity by around 100Hz in (optional) combination with boosting or cutting the bass at the same time. The High control is an additional EQ band placed in front of the preamp tube; its peaking filter boosts or cuts high-frequency content around 10kHz — essential for provoking or taming BIG AL’s potentially aggressive treble!
The straightforward user interface is spiced up with a jumper matrix, allowing access to BIG AL’s core circuitry: E (Emphasis Shift), B (Bass Compensator), and V (Voltage Sag) provide powerful options with which to make complex changes to the distortion profile on the fly by simply inserting or pulling out a few (virtual) plugs. An AL4 power pentode and its output transformer act as the finishing spice, driven hot by the preamp stage.
And anyone wondering what this all adds up to need not trouble themselves any longer because BIG AL is a truly gorgeous kind of harmonic saturation that will always sound organic, musical, and bold!