Ключевые слова: amplifier, anode, background, black, cathode, component, current, device, diode, edison, electric, electrical, electricity, electron, electronic, electronics, equipment, glass, history, industry, invention, isolated, lamp, macro, metallic, obsolete, old, oldies, pentode, power, radio, reflection, retro, science, technology, television, tetrode, thermoionic, triode, tube, vacuum, valve, vintage,