03-01-2018, 10:02 AM
That article says a lot about live chassis in Oz. For example:
Quote:Aside from that, live chassis radios and televisions are against the Australian culture of having an isolated and always safe chassis which can be earthed. Hence, they were intensely disliked by many servicemen. In fact, the R2M was the only live chassis Australian made television since the late 1950's, when even Ekco changed over to a transformer isolated design. Few live chassis sets existed in Australia. Ekco was the most popular and well known, but there were some early portables made by Admiral, Astor, and Pope Motorola.
To placate the conservative serviceman, the R2M is fitted with two neon lamps to indicate if the chassis is connected to the live or neutral. It's quite an ingenious idea which would have minimal increase to the cost. The mains earth is connected only to this warning circuit, and in the case of 17" portables, to the earphone socket as protection should the speaker transformer insulation fail. As a rental set, only the company technicians would be working on the sets, not servicemen at large. Thus, the live chassis work would be fairly confined to a few. For anyone with a phobia about live chassis equipment, the obvious solution is to use an isolating transformer.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
