Preamp Gain Stages - The Plate Resistor: Values, gain, tones and theory incl load lines!

A deep dive into the humble plate resistor in a 12AX7 gain stage. What is it's purpose and what impact is there on gain and tone with different values. This video examines a stock Marshall 100k value against a 330k in 3 ways, measurements, tone and theory. https://headfirstamplification.com 0:00 Intro 1:16 DMM & Scope measurements 6:20 Tone test 7:54 Theory 22:22 Conclusion