There are a few notices of various noises caused by various items and valves in some of the technical literature. None are very descriptive as Packard usually just called things "disturbances" or "rattles". Most would seem to apply to the earlier units but might be worthwhile to have a look at them anyway.https://packardinfo.com/xoops/html/modules/serviceinfo/catindex.php?cat=9&series=2
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