calculatorLaunch me!

guitar amp resistor

What does this calculator do?

Noise is an important consideration in preamp design, particularly in the first stage. Thermal noise is generated by the individual movements of electrons in the preamp's resistors. The calculator computes the RMS thermal noise voltage based on the resistor value, its temperature, and the audio frequency bandwidth (the range of frequencies amplified by the guitar amp.) It assumes the resistor is in thermal equilibrium, thereby maintaining a constant temperature.

Our new book puts these calculators through their paces!

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.

Guitar Amplifier Electronics: Basic Theory

Guitar Amplifier Electronics: Basic Theory

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.


1Richard Kuehnel, Vacuum-Tube Circuit Design: Guitar Amplifier Preamps, 2nd Ed., (Seattle: Pentode Press, 2009).