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

boiss · 21st Oct 2006, 6:09 pm

Ed, One thing that I've noticed is that they are not all wound in the same way. On a 100VA one the primary is on the outside while on the 300VA one the secondary is on the outside. on the "300" the secondary is 12V quadrifilar. Im not going to try and rewind this one because I intend to use it for the heater supply (10V at 20A), it was to see what the tpv was. When I get another I suppose that I would need to rewind the whole thing anyway but not using multiple wires, after all 100W into 8 ohms is only about 6A pk. If I put the secondary on the outside I can play with the number of turns and matching quite easily. Do I have to use all of the toroid for each half of the primary or can I wind one winding per 180 degs of the toroid which would appear quicker and easier?
Mike.

21st Oct 2006, 6:09 pm	#15
boiss Pentode Join Date: Jun 2006 Location: Malaga, Spain. Posts: 235	Re: Toroids as O/P trannies Ed, One thing that I've noticed is that they are not all wound in the same way. On a 100VA one the primary is on the outside while on the 300VA one the secondary is on the outside. on the "300" the secondary is 12V quadrifilar. Im not going to try and rewind this one because I intend to use it for the heater supply (10V at 20A), it was to see what the tpv was. When I get another I suppose that I would need to rewind the whole thing anyway but not using multiple wires, after all 100W into 8 ohms is only about 6A pk. If I put the secondary on the outside I can play with the number of turns and matching quite easily. Do I have to use all of the toroid for each half of the primary or can I wind one winding per 180 degs of the toroid which would appear quicker and easier? Mike.