The Spark 2, on the other hand, is powered by the Bias tone engine which delivers an impressive 33 amp models, and a whopping 43 effects – but that’s not all, the Positive Grid app also grants ...

Cue Positive Grid with its 12 Days of Gearmas sale ... From the Spark Mini or the Spark Go portable guitar amps to the BIAS FX 2 award-winning guitar amp and effects software, there’s something ...

but closer examination reveals a grid bias circuit more reminiscent of a bipolar transistor. This results in a positive grid voltage rather than the more usual negative, and an unusually high 0.3 ...