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I don't recall any safety cap issues with RCA. Zenith was the main culprit with their 4-lead safety cap that was used in the early "E" and "F" line chromacolor II sets. This cap would open, causing the HV to skyrocket; thus, blowing off the neck of the CRT and damaging other parts. It wasn't long before Zenith issued an upgraded orange drop cap and the white safety cap was to be replaced, no matter the reason for service.
Magnavox also used a paper/oil 4-lead cap in several of their sets during the '70's and early '80's. In some cases, these caps would open and blow the neck off the CRT. In most cases, these caps would short and trip the circuit breaker on the back of the TV. When I run up on one of these bad caps, I now replace it with an orange drop.
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