Sorry it took so long for someone to give you an answer, but busy, busy, busy etc. Anyway, I used to work in a radiostation where we used B77's, and I really liked them. Are you sure the heads show some wear or are just plain dirty? If the latter is the case, that's easy to clean with some alcohol and some, I don't know the English word, those things to clear your ears with. If, on the other hand, the haeds are damaged, forget it. The replacement is very expensive, and if you don't replace them, you'll never get the soundquality the Revox is capable of, and it might even damage your tapes..... Michiel.
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