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With a fixed bias amp, you bias it yourself. So basically, with a cathode bias amp, the amp biases itself. In a fixed bias amp, the bias remains fixed, and is set with either a potentiometer or a resistor. In a cathode bias amp, the bias changes with the load on the tubes. But the terms class A among guitar amps seems to refer instead to "cathode bias", and class AB seems to mean "fixed bias". You can research more of this on your own if you like, and graphs will help to explain it better than words alone.Īnyway, few, if any guitar amps are actually class A amplifiers except at low volume settings.
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Class AB would mean that the amp only draws full current at peak times during the cycle. Class A actually means that the amp is drawing full current at all times throughout the cycle. However, just like "tremolo" and "vibrato", the terms have come to mean different things to guitar players than to the rest of the world. And, despite their inclusion in Focusrite’s Plugin Collective, they also make critically acclaimed hardware, including the flagship BIAS Head guitar amp and several other real-life pieces of gear such as the BIAS Distortion pedal.Class A doesn't necessarily mean anything about biasing. Since then, they’ve grown to an almost hundred-strong crew of self-confessed ‘tone geeks’ from all over the world, from home base in California to the UK, Germany, Italy, Spain, and Taiwan. Positive Grid has risen rapidly as a leader in guitar tone science, since starting life as a small collective of engineers and guitar players in 2008.
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