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Duty-Cycle Modulation

For class A tube amplifier simulation, there should be level-dependent duty-cycle modulation as a function:10.3
  • 50% at low amplitude levels (no duty-cycle modulation)
  • 55-65% duty cycle at high levels
A simple method for implementing duty-cycle modulation is to offset the input to nonlinearity Eq.$ \,$(9.5) by a constant, such as input RMS level times some scale factor.

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