Repairing a Racal-Dana 9900, I had to check whether the Ferranti 22-4601 ceramic IC was made from Beryllium Oxide or not.
BeO is a toxic and dangerous substance in dust form........and I was filing it down!
I checked the tester using a real diamond and it worked, so tested the ceramic IC.
Here's the repair in question, see the comments below the video for the discussion there also:
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BeO info:
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#electronicscreators
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