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In Reply to: RE: secodary filament amperage posted by tubeflash on October 06, 2010 at 12:29:17
The lead size does not necessarily match the winding size. Most transformers are wound with 700cm of copper per ampere. Range from 500cm to 1000cm has been used over the years. The winding current rating is same as what the transformer manufacture specified.
When some DIYers want to push to limits, should have at least 6 volts with connected load and many consider that voltage under load the safe outer limit, but opinions will vary. Personally, I usually do not push more than 10-15% over specified current specifications. And, I never push HV secondaries. I prefer to load to 50% of the HV current rating and especially so with capacitor input filter.
Follow Ups:
so you are saying that the EI core trans was designed at about 500 cmil
per amp, but the toroidal was designed at 1000 cmil for the center taped filament and at 500 cmil for the other filament. it seems strange to me that the designer of the toroid would use a 1000 and a 500 cmil spec in the same transformer, when both taps are rated at 4 amps???
All transformers used 500 to 1000cm of copper wire per ampere. Older transformers used larger wires due to lower temperature rating of the wire insulation. Standard was 700cm. The core type has nothing to do with wire size.
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