How does a vacuum tube amplifier work?

I have posted a video on Youtube explaining how a tube amp works or valves, illustrating the operation of each of the stages in the simplest possible way. This is a beautiful 1950s Pathfinder amp that I got my hands on recently. Like most amplifiers, its design is simple but functional, as well as PERFECT for a didactic explanation of its operation.

Tube amplifier operation video

I leave you with the video, in it I have published the schematic diagram of the circuit with all its details, from the rectifier to the power amplification stage. I hope it is to your liking and usefulness.

Erratum:  In the video I present the power supply rectifier as a half-wave rectifier, when it is actually a full-wave rectifier. Thanks to my friend Taoiste, who pointed out to me that it is a double diode.

On this same blog I have published another article about how to convert one of these general-purpose amplifiers, or even a tube radio, into an excellent electric guitar amplifier. Here I leave you a link:

Converting a vacuum tube radio into an electric guitar amplifier

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If valve sound draws you in, see how to turn an old radio into a guitar amp and the restoration of a vintage amplifier. More in Electronics.