Never owned a Sylvania phono (have owned 3 of their tube TVs though). Got any pictures of the unit to give us an idea how it's put together.
Typically grille cloth isn't designed to be removable, though the boards it mounts to usually are designed to be removable (usually the speaker comes along for the ride with the board and cloth) though you often have to open up the cabinet to remove the speaker board. Some sets glue the cloth, some sets staple, others hold it in with compression. Once you get the board separated from the cabinet it should become obvious which method holds the cloth to the board.
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