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Old 25th Sep 2018, 10:01 am   #27
stuarth
Heptode
 
Join Date: Feb 2010
Location: Heysham, Lancashire, UK.
Posts: 665
Default Re: Transformer safety?

I would have thought that many 50+ year old sets would not meet current “double insulated” standards, whether live chassis or not.

With a live chassis set, you need to look at and possibly modify aerial and earth connections, gram inputs where fitted, and some sets even had speaker outputs using the output transformer for mains isolation. Then there are sets such as the DAC90 where it is difficult to ensure that the chassis is always connected to neutral.

For a set with an isolation transformer, fitting a 3-core mains lead and fused plug should protect from failure of the transformer (or the wiring to the on/off switch etc).

In truth of course, we don’t necessarily choose our favourite sets by their chassis isolation, but I think it’s easier to improve the safety of a set with a double wound mains transformer than one with a live chassis.

Stuart
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