Word: hums
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Dates: during 1970-1979
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...Judge Sirica's court last week, Miss Woods testified that she must have been responsible for at least 4½ minutes of a raspy, overriding hum on the tape of a talk between Nixon and H.R. Haldeman, then his Chief of Staff, on June 20, 1972, just three days after the Watergate burglary. Archibald Cox, the fired Watergate special prosecutor, had asked for the tape last July 23, contending that "the inference is almost irresistible" that Haldeman and former Domestic Affairs Adviser John Ehrlichman had reported to Nixon on that day whatever they knew about the Watergate wiretapping operation. Further, said...
...secretary was drawn reluctantly back into Sirica's courtroom last week after an embarrassed and nervous White House counsel, J. Fred Buzhardt, told the judge on Nov. 21 that 18 minutes of Nixon's June 20 conversation with Haldeman was totally obscured by a persistent hum. At the time Buzhardt said that neither he nor Government technicians could explain how the noise had originated. But last week he said that an explanation had been found, and that Miss Woods would provide...
Other technical experts consulted by TIME confirmed that the description of the noise suggested a typical 60-cycle A.C. hum,* which is not uncommon in unprofessional recording...
...White House used relatively small (11 by 10 by 4 in.) Sony Model 800B recorders for taping conversations in the Oval Office and the President's Executive Office Building hideaway. On such equipment it takes a malfunction, most commonly in a microphone cable, to pick up an A.C. hum, explains Irving Teibel, president of New York's Syntonic Research Inc. "This is quite common in portable recorders," he adds, but usually affects an entire tape...
...Normal U.S. house current alternates at 60 cycles, which is an audible frequency. It can be radiated through adjacent unshielded wires, resulting in a hum when one of the wires is related to an audio amplifier circuit...