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Well, ALL my R-3XXs have Permeable Tuning.. Kinda neat to run the R-389's "Motor Tune" gizmo, & watch 'em run up 'n' down.. There MUST be SOME benefit to using it, or Collins, who had Carte Blanche on how they designed & built the R-3xxs, wouldn't have used it..
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Benevolent Despot
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