Hello friends yoreparo colleagues I wish you a happy new year 2019 .... I bring you this concern before making a mistake .... I want to build a transformer of 120 goes to the primary since I am from Colombia and the network is 115va .. .and for the secondary one that delivers me 33v 0v 33v with central tap ... the problem is that they are lean .... and the magnet copper wire is also very expensive .... my concern is the windings can be made From my traffic with normal copper wire, bare bone without layers or anything ... bone that red copper that has coatings ...

Meygil you can get a second transformer (waste equipment) sony or aiwa type.

Or join two sources of serial buyer would be 38 v and would have a central bypass and without a lower voltage do a voltage divider with two resistors or a potentiometer