Re: 1939 KB 830 Receiver totally untouched.
On a three-phase supply, 127V phase-to-earth gives 220V phase-to-phase. Parts of the Continent were wired as 127/220V, and parts of Latin America still are: 120V appliances from the USA can usually be used on 127V, though motors will run at the wrong speed if the local frequency is 50 rather than 60Hz.
The UK standardised on 240/415V when it was decided to build the National Grid, but there were still local supplies of non-standard voltages and frequencies until the 1960s in some areas. Miners' cottages were often supplied with DC from the Pit's own supply.
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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