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http://www.gutenberg.org/files/29503/29503.txt

which doesn't make a lot of sense. But it was a bar. It had a big TV set going ya-ta-ta ya-ta-ta in three glorious colors, and a jukebox that tried to drown out the TV with that lousy music they play. Anyway, it wasn't a kid hangout. I kind of like it. But I wasn't supposed to be there at all; it's in the contract. I was supposed to stay in New York and the New England states.

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It seems to be the case; however, I wonder if it is correct since he never used the word jukeboxes (he only used the word jukebox).
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Yes, in this register, 'they' is fine, and it does refer to 'jukeboxes [of that kind]'.
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thank you