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I feel like this was discussed on your last thread on this set, but I don't have time to dig for the info (BTW it's kinda moderation policy here to not allow multiple topics on the same TV to avoid this situation) but if you have anything that can generate a test pattern IF signal on the frequency this uses (such as a B&K 1075-1077 family analyst, modified Sencore VA-62, another working old IF band TV tapped for signal just before the detector) signal injection at the IF grids in your Motorola may yield some guidance on where the problem is.
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