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Rockolas use pretty much the same mechanism from the very early 60's to the late 70's. We have worked on a lot of them. The mechanism is probably the simplest out of all the major types and most types use a magnetic cartridge for good sound quality (some did use a ceramic but they are easily convertible to magnetic).
I think Rockola went to transistorized amps around 1967 or so. The last tube type amps used 7868's. Rowe jukeboxes continued to use tubes into the early-mid 70's.
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