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Valve amplifier - Wikipedia
https://en.wikipedia.org/wiki/Valve_amplifier#:~:text=A%20valve%20amplifier%20or%20tube%20amplifier%20is%20a,solid%20state%20amplifiers%20in%20the%201960s%20and%201970s.
Mostly Audio - Simple Valve Theory
https://www.mostlyaudio.com/valvetheory1.html
Valve amplifiers distort in a different way from most transistors. Valves tend to produce 2nd harmonic distortions; whereas, transistors tend to produce 3rd harmonic distortion. Obviously, whichever type, we always try to reduce the …
Valve Theory #1
http://livinginthepast-audioweb.co.uk/index.php?p=vtheory
Here, the first valve of the recording amplifier has its cathode directly connected to ground. Hence, positive going signals from the input, typically from a microphone, cause the grid to be positively biased, a current then flowing to the cathode, like a diode.
Chapter 1: Fundamentals of Amplification
http://www.valvewizard.co.uk/Common_Gain_Stage.pdf
Designing Valve Preamps for Guitar and Bass 2 Fig 1.1: Current and voltage in a simple diode circuit. 1.1: Basic Theory of Valves A thermionic valve or vacuum tube contains two or more electrodes suspended inside a glass bulb. Any air inside the bulb is thoroughly removed during manufacture, leaving only a vacuum.
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