Fixed vs. Cathode Bias Tube Guitar Amps - what's the difference??

Biasing Single-Ended Amplifier Output Tubes: A Basic Explanation and Demonstration

Essential Reverb: Cathode vs Fixed Bias

The Effect of Output Tube Bias on Tone, Gain, and Headroom.....A Side-by-Side Comparison

How to Bias Your Guitar Tube Amp

How To Use Two Guitar Amps Together [Connections, Phase, Polarity & Why Analog Dry-Through Matters]

Preamp Gain Stages: the Cathode Resistor. GAIN, TONES & THEORY!!!

Swapping Valves And Biasing Amplifiers

How Tube Amplifiers Work, Part 1: The Power Supply

Dr. Z AMA: "Tube Amp Bias"

Mastering Amp Biasing: A quick guide for biasing your valve amp

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

Eurotubes Generic Bias Video

Build Basics FAQ #3 : OUTPUT TRANSFORMERS!! ...and primary impedance

What wattage resistor to use in cathode bias tube amplifier?

Biasing Tube Amps

What Amateurs Don't Understand About Guitar Tone

Do You Always Need to Bias New Tubes?

How to Bias Your Amp Using the Tube Amp Doctor BiasMaster

How Tube Amplifiers Work, Part 2: The Pre-Amp and Power Amp

How To Cathode Bias Amplifiers Using Ohm's Law