Burndept operated in Blackheath in England from 1921 to 1931, producing some of the finest quality early radios, from small crystal sets to powerful four-valve loudspeaker-linked receivers. The brand name was Ethophone (Ethovox for the loudspeakers). They were the first to put domestic radio receivers into cars, aeroplanes, houseboats and yachts. The company made a delivery van in the form of a giant Ethophone V model, and placed a receiver on a hand cart with an aerial and loudspeakers. Unfortunately, like many pioneering organisations, Burndept saw the large market going to manufacturers less interested in novelty and more in cheapness and mass production. By 1927 the firm was in deep financial difficulty and was placed into receivership. In 1934 the old name was resurrected when it was bought by a Thomas Cole, a battery maker, who opened a factory at Erith and took on those Burndept staff who wanted to join him. His new trading name was Vidor. It remained a factory, passing through the ownership of various electrical manufacturers including Siemens and GEC, but it was demolished in December 1995.