[Arran]

A floating chassis/common negative is the standard among transformerless TVs and radios in Canada. In fact prior to 1939-40 or so they did not even allow AC/DC sets to be built or sold in Canada, so we have weird things like 4 tube sets and Bakelite sets with a power transformer, like the Canadian built version of a Stewart Warner Campus radio, the U.S ones use a ballast tube.
Regards
Arran