Tube Lab - Vacuum Tube Audio Amplifier, Discrete Semiconductor Circuit Projects
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Voltage Regulators II
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Lessons In Electric Circuits -- Volume VI (Experiments) - Chapter 5
Tube Amp trial - CircuitLab
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Glass-Audio-1995-5
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Hybrid vacuum tube/solid-state audio power amplifier - EDN
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Class D Audio Amplifier Hardware Design - Phil's Lab #125
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Microwave LNA Amplifier - Reverse Engineering
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Understanding RF/Microwave Push-Pull Amplifier Design - Mini-Circuits Blog
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Making a Modern Radio Nuts & Volts Magazine
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Vacuum Tube Audio Amplifier Lessons in Electric Circuits: Volume VI - Experiments
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Lessons In Electric Circuits -- Volume III (Semiconductors) - Chapter 8