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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 13th June 2010, 12:45 PM   #21
EWBrown is offline EWBrown  United States
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Adding extra windings whould not affect the other windings' voltage outputs. THe main consideration is to not exceed the toriod's total maximum VA capacity - which is fairly unlikely with most of these heavy duty Antek trannies.

The extra winding's voltage will drop somewhat under load, so plan on adding about 10-15% extra voltagewith no current load.

The other major consideration if you are adding a 5V rectifier winding, is that this winding will carry the fill B+ voltage, so insulate accordingly, use the aforementioned Kapton tape of similar, to prevent HV to chassis arc-overs.

ed B in NC
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Old 13th June 2010, 02:08 PM   #22
TerrySmith is offline TerrySmith  United States
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Also Antek toroids are rated for 50hz, which means you have more output at 60hz!
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Old 14th June 2010, 12:17 AM   #23
Ty_Bower is offline Ty_Bower  United States
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Originally Posted by EWBrown View Post
Adding extra windings whould not affect the other windings' voltage outputs.
Sorry, of course you are correct. I was confused, and thinking about inductors in series on a common core. In that case, there is mutual inductance to consider and the total inductance of both windings in series is Lt = L1 + L2 +/- 2M (depending on whether they are connected in phase or out).

If the windings are not connected to each other, this isn't an issue.
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