R ReRibbon Well-known member Joined Oct 29, 2013 Messages 254 Sep 1, 2015 #1 What is this best used for?
mjrippe Well-known member GDIY Supporter Joined Dec 27, 2011 Messages 2,967 Location Brooklyn, NY Sep 1, 2015 #2 Google the 1960 UTC catalog. It is a variable inductor, not a transformer.