The Axe-Fx II uses a highly sophisticated approach that involves multiple triode simulators and a dedicated power amp simulator. "Most products now use a single dynamic waveshaper to simulate the entire nonlinear response of the amplifier. master the basics of preamp, power amp, and power supply design. Guitar Amplifier Electronics: Basic Theory The Line 6 waveshaper shows compression at the extremes of positive and negative input swings.īecause the curve for positive voltage swings is not the mirror image of 2įor a linear circuit the transfer function is a straight line. Here, for example, is a waveshaper included in a Line 6 patent. Guitar amp nonlinear behavior has traditionally been modeled by a waveshaper, which describes the output New! Guitar Amplifier Electronics: Fender Deluxe - from TV front to narrow panel to brownface to blackface Reverb The output waveform becomes more symmetrical and 3 rd-harmonic distortion begins to dominate.īeyond that point the output signal is at its maximum - it cannot respond to further increases in input signal amplitude. When negative grid voltage swings exceed -3.5V, positive plate voltage swings transition Plateaus early and lasts until negative grid voltage swings reach approximately -3V.Īt that point, peak-to-peak plate voltage swing has almost reached its limits. The severe asymmetry produces bucketloads of 2 nd-harmonic distortion that Negative swings of the input signal run free. To a maximum effects send swing of about half a volt peak.Īccording to the 12AX7 Calculator, the grid is biased at a very warm -1V.Īs the input signal level increases, positive grid voltage swings are compressed by the effects of grid current R1 and R2 form a voltage divider to reduce a maximum plate voltage swing of about 100V peak The cathode resistor is fully bypassed to prevent negative feedback from reducing the triode circuit's The design is similar to the preamp distortion stage in the Mesa/Boogie Mk I. This is the final stage of a preamp designed to drive an effects loopĪnd is the first preamp stage to break into distortion. Modern models include accurate emulation of both preamp and power amp distortionĬonsider, for example, this preamp stage. The distortion of an entire guitar amplifier. Gone are the days of applying a single, overly simplistic sigmoid function to a sample sequence to digitally model
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