On Sun, May 04, 2014 at 12:30:53PM +1000, cdb wrote: > 4. The transformer secondary does indeed have the centre tap shorted > to the neutral/return side of the transformer. Okay, the unswitched neutral on the primary. And a post-rectifier path back to active. Fascinating. Really interested in photographs now. Is there any indication on the transformer that might explain how far toward the turns centre this centre tap might be? --=20 James Cameron http://quozl.linux.org.au/ --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .