WTAO-TV changed its call letters to WXHR-TV. The Kaiser and Field years In June 1966, Harvey Radio Laboratories sold its entire Boston-area broadcasting operation to Kaiser Broadcasting. Kaiser then sold 50 percent to The Boston Globe. Kaiser ordered $3 million in new RCA equipment to outfit a new channel 56 on an old construction permit. The new station also made a major push into sports, with away games of the Boston Celtics and Boston Bruins. The Kaiser-Globe partnership began operating the radio stations in November 1966, and under new WKBG-TV call letters, channel 56 returned to the air on December 21, 1966—two days after the opening ceremonies, because the station was hit with last-minute technical delays due to bad weather. Little except the transmitter site was retained from the prior WTAO-TV. The effective radiated power at launch was 282,000 watts, up from 20,000, and a second boost came months after launch. After briefly operating from temporary quarters at 1050 Commonwealth Avenue in Brookline, the Kaiser-Globe partnership purchased a former supermarket next to the newspaper in Dorchester in 1968 and built a $2.25 million studio facility on the property, which was completed in 1969. This came alongside a move of the transmitter from Woburn to Needham on a tower shared with WSBK-TV (the former WIHS-TV), further expanding the station's signal and filling in gaps to the south and west. Despite all of this investment, WKBG-TV had lost nearly $11 million from its launch to November 1970. By 1969, WSBK-TV had secured both the Bruins and Celtics; when it had to choose one or the other, WKBG had opted for the Celtics, only for the Bruins to become resurgent on channel 38 and the Celtics to falter. It also aired telecasts of the World Hockey Association's New England Whalers from 1972 to 1974. After having cut from 50 to 10 percent ownership in 1968, in 1974, the Globe sold its share in WKBG back to Kaiser in exchange for a $500,000 note and $270,000 in advertising credit for the station; the newspaper recorded a $289,000 loss on its broadcasting investment. The call letters were then changed to the current WLVI-TV (reflecting the Roman numeral for 56, LVI) on May 1, in part because WKBG was being confused with other local stations in ratings diaries. Kaiser Broadcasting merged with Chicago-based Field Communications in 1973 as part of a joint venture between the companies.