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There were series and parallel Christmas lights in the old days and both still exist as LED lights today. The big ones tend to be parallel and the small ones tend to be series.
It's a good idea to have some understanding of series and parallel circuit principals before working on vintage electronics otherwise you're stuck at parts changer status and mostly helpless (only recourse is spending lots of money on a parts cannon that may or may not get the actual problem) to track down the root cause when it doesn't work post recap.
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