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When these CC2 sets came into the shop, one thing we would automatically do is clean the tripler and the area around it inspecting it for cracks. If we found anything, it would be replaced, even if it was still working at the time.
I never had a problem with the Delta vs Inline tubes.
In the 1990's, I saw so many failed Zenith labeled tubes. I was so glad when they got too old to still be in warranty. I replaced at least 150 tubes in portables and consoles, and had to store the bad tubes until Zenith would OK the replacements.
Also, had to repair alot of chassis because of these bad tubes, too. Used to send some of them to PTS electronics in Indianapolis, until I got a repaired replacement module that had dead roaches in it.
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