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In 1965 I was working for Georgia Power Company and we bought a Tektronix storage oscilloscope - a big purchase back then. Included in the purchase price was a one day class by Tektronix. The Tektronix guy started off telling us how to periodically clean the interior of the scope. He recommended soap and water, just like your method of cleaning, Crist. If Tektronix recommends it on a $3000 scope, it should be OK for a Philco Predicta!
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