U.S. Judge William O. Mehrtans yesterday denied a new trial for Orlando Bosch and eight other Cubans convicted in connection with bombings of ships.
    The judge tentatively set Dec. 13 for sentencing.
    Melvyn Greenspahn; defense attorney, argued that tape recordings admitted as evidence violated constitutional protection against self-incrimination.
    The tapes were made with a microphone hidden in the clothing of Ricardo Morales, a paid informer who infiltrated a self-styled Cuban Power group.
    Bosch, an anti-Castro exile, could get 28 years in prison and the other defendants lesser terms.