Virtually all Australian made TV sets had an earthed, transformer isolated chassis. There were very few using the European live chassis series heater approach as this was disliked intensely by the servicing trade. Further, the half wave rectifiers used in these sets put DC onto the mains which didn't go down too well with the supply authorities.
There was no actual need to make sets this way as DC mains had been all but phased out by the time TV arrived here in 1956. Apart from a small section of Sydney's CBD, DC mains was never used in the capital cities.
Further details on set design for those interested are on my site:
http://www.users.bigpond.com/cool386/ekco/ekco.htm With the advent of colour (and imported sets) during the mid 70's, there were a number of European and Japanese made sets with a non isolated chassis, so Aussie technicians had no choice but to get used to the idea. Fortunately, most of the larger set manufacturers like Philips and National (Panasonic) who were assembling locally, continued to give us isolated power supplies with their Australianised models, but a few like Sony and Sharp didn't. With many sets this was nothing more than a 240:240V (for the UK designs) or a 240:115V (for the Japanese sets) isolating transfomer bolted to the bottom of the cabinet. Philips modified their switchmode power supply so that it had isolated secondaries (the Europeans had an autotransformer in their version).
Common among some Japanese sets were two power switches. One was the normal on/off switch usually combined with the volume control. Hidden away under a control flap was the other switch which disconnected the set from the mains. The reason? The user's on/off switch only disconnected the transformer winding feeding the DC supplies of the set. A second pole on the switch in the CRT's heater supply switched over from the 6.3V winding to a tapping of about 4V to leave the heater warm(some used a resistor or diode to drop the voltage in standby instead). This way the set had an "instant on" feature.
With the flood of Chinese sets in the 80's, live chassis became common, and with bridge rectifiers the chassis is live regardless of mains plug polarity. I've seen some horrifying instances of headphones connected to these sets, or the aerial isolation capacitors bypassed (damaged aerial socket), by unknowing people. And yes there have been electrocutions.
Nowadays, with the requirement for external speakers and AV sockets most are now using isolated switchmode power supplies, though classing them as double insulated appliances seems to be a bit optimistic.
