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Schemario radio tv 1962
Oscilloscopio Scuola Radio Elettra(Grazie all'amico Giovanni da Nola)
Tektronix - Troubleshooting Your Oscilloscope 1989
Pete Millett's DIY Audio pages (Potete trovare testi quali: Amplifier Builders Guide, Audels Radiomans Guide, Basic Radio - The Essentials of Electron tubes and their Circuits, Basic Theory and Applications of Electron Tubes, The Cathode-ray tube at Work, Coyne Electrical and Radio Trouble Shooting Manual, Dynamical Analogies, Electron-Tube Circuits, Electron Tube Design, Electron Tubes in Industry, Electronic Amplifier Circuits...)