Amplifying With Vacuum Tubes: Circuit Design Guide for the Novice: Gauss, Carl: 9781721146086: Amazon.com: Books
Vacuum Tube Circuit Design: Guitar Amplifier Preamps, Second Edition: Richard Kuehnel: 9780976982265: Amazon.com: Books
Build a Single-Ended Guitar Tube Amplifier | by Circuit Cellar | AudioXpress | Medium
Vacuum Tube Circuit Design: Guitar Amplifier Power Amps: Richard Kuehnel: 9780976982241: Amazon.com: Books
Single-Ended (SE) 6550 Tube Amplifier Schematic
Keep Those Filaments Lit, Design Your Own Vacuum Tube Audio Equipment | Hackaday
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Applied Sciences | Free Full-Text | Self-Balancing Power Amplifier with a Minimal DC Offset for Launcher Automation Control Circuits of a Surface-to-Air Missile System