I can't dig it at all because there's no tube

from Lupe Fiasco (Ft. Ed Sheeran) – Old School Love Lyrics on Rap Genius


This goes with the next line, “tube” amplifiers were generally used in older studios, which gave a warm sound to the sounds being produced. Without a tube, there is no warmth to the sound, much like the vocals the Lupe is referring to in the next verse.

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