I don't know what type of magnet the Tannoy's have, but something to keep in mind is that AlNiCo magnets get weaker with age. Also, they can loose much of their magnetism if they are dropped or other impact occurs. Having them re-magnetised can be tricky, depending on their design. Most of the vintage AlNiCo drivers I've had are fine, but I've had a couple that had the magnet much weaker than it should be.
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