Valves / Vacuum Tubes

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[1] AVO VAlve Testers

[2] Steinhart Schematic

[3] 100 valve amplifiers: A history

[4] Interesting article on the history of the "Williamson" circuit

[5] What Make Valve?

[6] Valve etiquette and care

[7] Philips AG9015 - interesting output stage

[8] DIY Speaker recommendation for EL34 push-pull amplifier

[9] Gunter Steinhart tvp-77ul

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