| http://www.w3.org/ns/prov#value | - In a cathode voltage level of this type, it is possible to take account of tolerances and/or ageing effects of the picture tube, in order that, during cut-off regulation, there is a reserve, in particular for the occurrence of maximum tolerances and/or ageing effects, which suffices to ensure that the RGB signals cannot be shifted into saturation of the video output amplifier stages, or???in the e
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