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Old 07-08-2014, 08:27 PM
Sandy G's Avatar
Sandy G Sandy G is offline
Spiteful Old Cuss
 
Join Date: May 2003
Location: Rogersville, Tennessee
Posts: 9,571
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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