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Yes, the neon light fires at a certain voltage and blanks the video. As Zeno said, the early CTC63 chassis versions did collapse the vertical instead of blanking the video. The whole idea was to force the owner of the set to have the problem repaired. This was back when everyone was told their televisions were emitting deadly X-rays. The original part number for the VDR was 133137, it was later superseded by 132995. Moyers or Talon may have them. I don't know of any reliable way to "check" a VDR other than by subbing it. Someone determined a way of crossing the always defective Zenith set VDRs to a modern replacement, but, I've not seen that for the RCA ones.
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