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Vacuum Tube Audio Amplifier - All About Circuits
https://www.allaboutcircuits.com/textbook/experiments/chpt-5/vacuum-tube-audio-amplifier/
A transformer is essential at the output of the amplifier circuit for “matching” the impedances of vacuum tube and speaker. Since the vacuum tube is a high-voltage, low-current device, and most speakers are low-voltage, high-current devices, the mismatch between them would result in very audio low power output if they were directly connected.
Vacuum Tube Audio
https://www.vacuumtubeaudio.info/
This site supports The TAB Guide to Vacuum Tube Audio in a number of ways, including the following: For more detailed information about the book see the Table of Contents and the Preface. This book was written in 2010 and published in 2011. At the time, the only way to build a vacuum tube amplifier was to settle on a design, acquire the parts ...
DIY Vacuum Tube (Valve) Amplifier Projects - Hi-Fi Audio
https://diyaudioprojects.com/Tubes/tubes.htm
The headphone amplifier is similar to the previous version in that a single 12AU7 (ECC82) vacuum tube is used for voltage gain and an IRF510 MOSFET follower stage is used to provide current to drive demanding headphones. The hybrid tube and MOSFET amplifier operates off a 12V SLA battery so there are no high voltage concerns.
Guide to Vacuum Tube Amplifier Design - Vacuum Tube ...
https://www.vtadiy.com/book/
This guide discusses all relevant aspects for an integrated push-pull vacuum tube amplifier design, including the power supply unit. Beside that, EL34, EL84, and 12AX7 vacuum tubes are used in many practical examples, to design the various parts of the circuits and to compute the values of the needed components.
Vacuum Tube Audio - New Project - The Dorm Amp
https://www.vacuumtubeaudio.info/project5.htm
I realize this project is a deviation from the vacuum tube theme of this web site; however, having a hybrid tube/transistor amplifier option may solve certain implementation problems for some builders. The updated circuit will be used in any future build of the 20 W Stereo Integrated Hybrid Amplifier. Update 11
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