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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: secodary filament amperage posted by tubeflash on October 6, 2010 at 12:29:17:
There are other factors to consider besides current density in secondary wire.
First is maximum copper loss - a transformer design may be close to maximum loss, so one winding is changed to reduce it.
Regulation depends on wire resistance, and a particular winding may need better regulation, so would use heavier wire. Toroids have a longer wire length than an EI transformer and may use a heavier gauge for the same rating. If a 6.3V winding ended up with an odd number of turns, then a 3.15V winding would either be too high or low by half a turn. Using heavier wire would give less voltage drop, staying within rating.
Another reason is safety. A unit may be required to pass a safety test where each transformer secondary is shorted; it passes if the primary fuse blows each time. The smaller the secondary, the poorer the coupling and the less primary current that's drawn. Oversize wire may help, as may changing the winding sequence of the secondary layers.
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- RE: secodary filament amperage - Tom Bavis 10/9/1005:31:02 10/9/10 (0)
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