Re: Tesla 525a
If it is a Selenium Rectifier they are usually past their best 50+ years on. A modern Silicon rectifier will need a resistor to keep the voltages down a bit. Try ~100 ohms to get the correct 210v. The rectifier needs to be on the chassis it act as a heat sink. Also the 100R resistor needs to be maybe 5w on a heat sink, a bit of experimentation needed, unless someone can do the maths.
John.
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