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There certainly should be a fail-safe mechanism of action to protect the main actives and constantly monitor the supply voltage and amperage. I suppose the cost of implementing even a basic feedback oscillator on the b+ line would not be worth it to the manufacturer in a SPC set. Yet the V-Chip for censoring content & the other "extra features" are deemed of higher importance in these TVs.
My favorite era was right before OSD became common. They were built to be maintained and repaired if needed.
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