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Old 11-12-2017, 09:04 PM
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N2IXK N2IXK is offline
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Join Date: Apr 2011
Location: Sittin' on the "Group W" bench...
Posts: 799
Yes, 5642s are still pretty common. And replaceable by NTE517 silicon diodes if desired. I have done so on a couple 500 series scopes, as well as a 453. It takes the filament load off the HV transformer, promoting cooler operation.
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