Jim Marshall crafted guitar amplifier masterpieces without the assistance of computers, software or the Internet... In 1963 "graphical methods" meant drawing Bode plots with a pencil and ruler... Times have changed. ● Master the basics ● Design your amp ● Know it works Amp Design for the 21st Century

calculatorLaunch me!

What does this calculator do?

guitar amp coupling capacitor circuit

The coupling capacitor CG blocks the high DC voltage at the plate of the driving tube while allowing audio signals to pass. Unless bass attenuation is desired, the capacitor needs to be large enough to induce very little signal attenuation at bass frequencies. (82Hz is the lowest note on a guitar with standard tuning.) It shouldn't be too large, however, or unwanted effects like blocking and motorboating may ensue.

The calculator plots gain versus frequency based on the output impedance of the driving stage, the capacitor value, and the volume control setting. If RV is a fixed resistor, set the control setting to 100 percent.

Copyright © 2005-2021 Amp Books LLC
All Rights Reserved