What causes vacuum tubes to red plate?

Understanding Vacuum Tube Amplifier Schematics - Push Pull - Part 3

Understanding Vacuum Tube Amplifier Schematics - Basics - Part 1

Guitar Amp Vacuum Tubes Part 1: Triodes and Tetrodes

How A Tube Works

What do vacuum tubes (valves) do?

Red Plating Vacuum Tubes to Destruction!

How Tube Amplifiers Work, Part 1: The Power Supply

How Vacuum Tubes Work

Audio Output Transformers Demystified - Ask Mark

Let's design an build a vacuum tube amplifier from scratch

Troubleshooting Your Tube Amplifier

How I repair a Fender Deluxe Reverb that is red plating.

Understanding Vacuum Tube Amplifier Schematics - Grounding - Part 6

Guitar Amp Tubes Part 2: Pentodes and Beam Tetrodes

Triode Tube Amplification Visual Demo

Dealing with the DEATH CAPACITOR in Vintage Gear

D-lab series Basic Training How to repair output tube red plate negative bias & safety lesson

What does the Choke in a Tube Power Supply do?

Are vacuum tubes worth it?

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