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Hi Charlie,
Older high voltage diodes are usually made up of a string of lower voltage diodes in series to get the desired breakdown voltage. A meter usually uses about 2 volts to measure a diode which is sufficient for any type of single diode. When they're in a chain like this you need to provide enough voltage for the sum of the diodes. Using 0.7 volts each, and guessing at 5 diodes, you would need more than 3.5 volts to forward bias the focus rectifier. You can try using a 9 volt battery and a resistor sufficient to keep the current to a milliamp or so, and set the meter to DC current to check the diode.
Darryl
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