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If the caps are good, a slow turn on over a few seconds (before the filaments get warm enough to bring up the sweeps) is OK, but over several minutes is not a good thing. Some horizontal output circuits will draw excessive current if the supply voltages are not near nominal. So, the very slow turn on should only be used in the beginning, with the HO removed, as a way to TRY reforming the caps. It's not necessary or wise when everything is working OK. The few-seconds turn-on may be life-extending, but by how much I'm not sure. Anyone have real info on this? Some brands of TVs used to advertise that they had this feature, but anything that was put in a set and then advertised may have been there half for real effect and half for advertising claims.
I would worry more about monitoring the line voltage and adjusting it to nominal rating.
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