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The RF HV supply generates a considerable amount of RFI (radio frequency interference). You may note that with the lid off the HV enclosure, RFI shows up in the picture as a herringbone pattern. This is why all the 7" sets had their HV supplies in sealed metal enclosures. Sets with a flyback type HV supply generate less RFI, so can be enclosed in a perforated enclosure.
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John Folsom
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