Did Nixon know he was secretly being taped?

The Secret Service also tapped the telephones in the Oval Office, in the President's EOB office, and in the Lincoln Sitting Room. ... Locator, a device used by the Secret Service to follow the President's movement in the White House complex, and would only be activated if the President was present in a room being recorded. read more

The Nixon White House tapes were ordered by the President himself, so it wasn't secret, and he did know it was happening. This was not He didn't turn the tapes off because it was exactly the sort of thing he was trying to record, and he believed that they were subject to Executive privilege. read more

However, it is expected that he also will ask for tapes of conversations between Mr. Nixon and Dean, and for certain other tapes, including one of a talk that Dean said former domestic adviser John D. Ehrlichman had with the President concerning executive clemency for convicted Watergate conspirator E. Howard Hunt. read more

As it happens, Nixon wasn’t the only president to record his conversations. Six American presidents — from Franklin Delano Roosevelt to Nixon — taped at least some of their conversations. President Ronald Reagan and his successors had several meetings videotaped. read more