He trained his reporters in covert tape-recording techniques and would even set up fake companies to carry out stings.

BBC: Tabloid tactics

One of the women, bridge club member Katherine Manweller, testified she saw the tape-recording equipment in a visit to Tripp's home.

CNN: Lewinsky to testify in Tripp wiretap case

These presidents were enraptured by the new technology of tape-recording, and touchingly confident that their tapes could be kept secret, so they recorded their conversations as no president has done since.

ECONOMIST: Taping for posterity

Standing at 6ft tall, the Quadraplex was intended for the professional market, but it represented a revolution in recording - its tape could be recorded over again and again.

BBC: News | UK | Video nation: 20 years of taping