I have a fixture F1 from the 1960s with two 2' fluorescent lights B1 and B2. Recently they both began to flicker. A second fixture F2 has a single 2' light B3 which did not flicker. In F2 I replaced B3 with B1. It did not flicker. I then replaced in F2 B1 with B2. It did flicker. I then in F1, put in B1 and B3. There was no flicker.
I didn't find the right solution from the internet.
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