The grid stopper resistor RGS blocks radio frequencies while allowing audio signals to pass. This keeps the amplifier from becoming a radio receiver and prevents the stage from breaking into parasitic oscillation.
Large values can be used to attenuate treble, but even if this is desirable there are much better ways of achieving it. In general there should be very little attenuation at 10kHz and substantial attenuation at 100kHz.
The frequency response for a given resistor value depends on the inter-electrode capacitances of the tube and the voltage gain that it achieves. The calculator computes the response at various frequencies based on these factors.
This new approach to guitar amplifier electronics embraces 2018 technology to deliver greater understanding with less math. Computer-based visualization replaces the traditional litany of mathematical formulas. The book's graphing calculators, free on this website, are designed for smartphones and laptops, making them as portable as the book that uses them.
Less Math, Greater Understanding
The book explains the principles of vacuum tube electronics and the design of preamp voltage amplification stages, cathode followers, tone stacks, power amps, phase inverters, negative feedback, and power supplies. An entire chapter is devoted to sculpting the dynamics of overdrive and harmonic distortion.
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