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In my experience the correlation between horizontal image linearity and HO Tube cathode current is very weak at best on roundy color sets. When performing the adjustment I have not seen any change in linearity while adjusting current from previous tech's setting to the setting that would yield minimum current, but I have read that good linearity and current can be in conflict in sam's folders for some of my sets.
My advice would be to monitor the cathode current on the first power up after the change and as soon as it starts to stabilize adjust the lin coil for minimum current.
I would look at the slug position of the old coil and try to roughly achieve that in the new coil before power up.
Under a minute of redplating should not damage anything(it is when the fly begins to heat up that bad things happen). But I doubt the lin coil could produce redplating unless there were serious circuit problems.
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