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Por qué dicen que un amplificador de bulbos o válvulas de vacío mejora el sonido de los archivos mp3 en un sistema de audio de gama alta? - Quora
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Amazon.com: Bluetooth Tube Amplifier Stereo Receiver - 500W Home Theater Audio Desktop Stereo Vacuum Tube Hi-Fi Power Amplifier Receiver w/ 4 Vacuum Tubes, USB Reader, CD/DVD Input, Subwoofer Output - Pyle PVTA80 :
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