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bias resistor. (electronics). A resistor used in the cathode or grid circuit of an electron tube to provide a voltage drop that serves as the bias. 1  Facebook.2  Twitter. â²bÄ«Â·És riâ²sisÂ·tÉr ]. (electronics). A resistor used in the cathode or grid circuit of an electron tube to provide a voltage drop that serves as the bias. 1  Facebook. 2  Twitter.
In cathode bias a small value resistor is placed between the cathode and the ground so it develops negative voltage on the cathode thus achieving bias. As you hit a note the tube calls for more power and negative voltage on the cathode decreases briefly changing the tubes bias.he terms cathode bias and fixed bias are often used to describe amps but lots of folks are not really sure what they mean. I will briefly provide a technical explanation and then provide some bullet points of the major differences in tone, maintenance and power.