My Dirt Transmitter for instance can go from super choked, gated, velcro ripping sound, 8bit, all the way through to fuzz face sounds and super smooth overdrive sounds, all just by turning the bias knob and adjusting all the other parameters to taste. The functionality in the case of a pedal is that by starving/overboosting the amplifying components you can radically change the character of the distortion. You'll usually see a bias knob on a fuzz, but I've seen recently some distortions and OD's with bias controls as well. Additionally, the power supply components were upgraded and a variable bias adjust added to facilitate the use of different tubes. There are two potential sources of systematic disagreement between methods of measurement: fixed and proportional bias. It may be to excessive, amp running very hot you can smell it is not right, probably hums, not tight. The purpose of comparing two methods of measurement of a continuous biological variable is to uncover systematic differences not to point to similarities. This may be insufficient, the amp will sound horrible and run cold, may not even work at all. This type can be modded to the best type, which is not only variable from side-to-side, but adjustable up-and-down, too. Amp bias is pretty much set and forget, the tubes like to see a certain amount of voltage. Assuming the amp is otherwise ok, if the amp’s bias is set correctly or not, the matched valves will each draw an equal amount of current. You can play your guitar through the amp each time you adjust the bias, and see how you like it. Obviously there are a lot of pedals, so what frequencies those knobs roll off and to what extent is going to be unique to each pedal.īias is pretty much the same concept, bias referers to how much power is being delivered to the amplifying components, ie, the tubes, transistors and/or diodes. Tone and Presence almost always refer to high end roll-off, similar to an amp.
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