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amp, ampere, amplification, amplifier, analog, anode, background, bulb, capacitor, cathode, circuit, colored, colorful, component, detail, device, diode, electric, electrical, electricity, electron, electronics, frequency, industry, lamp, obsolete, old, oldfashioned, panel, power, radio, radiopart, regulator, repair, resistor, retro, scheme, technology, tetrode, transformer, transistor, triode, tube, tuner, valve, vintage, voltage, wires, worn,