UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

boiss · 19th Oct 2006, 5:05 pm

That's an interesting point about the bifilar windings regarding the insulation and something I hadn't considered, especially as I could have 1KV across the windings. As far as the frequency response goes, they appear to be excellent from what I've managed to find on the net, with measured -3dB points of <20Hz and >150KHz for toroids up to 250VA. Opinion differs on Audio Assylum from working better than any EI core transformer but not as good as some of the best C core transformers to not being worth considering. Because Audio 100W O/P transformers cost well over £100 each if they are supposed to be any good, Financially out of the equation, some thought needs to be given to rewinding a toroidal transformer. It appears rather daunting but if it has only about 4 turns per volt, It may not be all that difficult after all to put on 2 separate windings.
Mike

19th Oct 2006, 5:05 pm	#5
boiss Pentode Join Date: Jun 2006 Location: Malaga, Spain. Posts: 235	Re: Toroids as O/P trannies That's an interesting point about the bifilar windings regarding the insulation and something I hadn't considered, especially as I could have 1KV across the windings. As far as the frequency response goes, they appear to be excellent from what I've managed to find on the net, with measured -3dB points of <20Hz and >150KHz for toroids up to 250VA. Opinion differs on Audio Assylum from working better than any EI core transformer but not as good as some of the best C core transformers to not being worth considering. Because Audio 100W O/P transformers cost well over £100 each if they are supposed to be any good, Financially out of the equation, some thought needs to be given to rewinding a toroidal transformer. It appears rather daunting but if it has only about 4 turns per volt, It may not be all that difficult after all to put on 2 separate windings. Mike