They are a single Ceramic bar magnet with 4 pole pieces, some of the really old ones have a single bar, however these are not Entwistle pickups, they are infact the only pickups in the Revelation range that are not Entwistle pickups.
The problems mentioned have been noticed, and we remedied it by actually turning the pickups around, as the loss was caused by the connecting wires being directly under the top strings, rather than the pole piece, when the pickup is swung around this lack of sensing area is directly under the bottom pair of strings which give a powerful enough signal to override the loss.
The entire problem has now been solved with our much updated JM 1 mandolin, which is more appropriately based on the Revelation RJT60, in this case we are using Entwistle "Undercover" technology and there is a powerful Entwistle UX3N humbucker mounted under the scratchplate, in all honesty this model is 100% up on the "Mandocaster"
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