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Had that problem on one of my old National (Panasonic decks), cleaned everything (no improvement) changed rotor and stator for capstan (not much change) replaced a couple of extra idlers and gears in reel drive (little improvement). Was quite prepared to assume it was a kind of servo problem on the main board and left it alone for a while. Later on the tension band for the supply reel disintegrated (as they do after a while) replaced this and re-adjusted it, and wow and flutter is much better as a result.
Hope this helps.
Tony
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