With a POD where the vacuum tube was invented in 1870s-early 1880s or earlier, what would the impact of the phonograph be if electrical recording was the first commerical process introduced in 1888 instead of acoustical recording? Acoustical phonographs would still be made, but recording studios would use electrical process instead. How would it change music, films, radio and television? Would records replace sheet music as the main product earlier?
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