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Not only is the scope new but I’m using a high quality and new TEKTRONIX probe. That could account for the difference in quality. Are we fairly certain this reversal is a scope setting issue or could the discriminator somehow be tuned to produce this? Does it make sense to replace all the resistors and ceramic caps in this area of the chassis? I know these stone caps rarely fail but you never know. I can’t find anything yet on the scope that suggests the horizontal polarity is being rotated out of phase to this degree.
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