Vacuum tubes - old electronic components, semiconductor devices, the predecessors of the transistor

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Photo credit: © Szasz-Fabian Jozsef / Alamy / Afripics
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Keywords: amplifier, anode, cathode, component, device, diode, electric, electrical, electricity, electronic, electronics, equipment, glass, isolated, lamp, macro, metallic, obsolete, oldies, power, radio, retro, science, semiconductor, style, technology, triode, tube, vacuum, valve, vintage