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True, but it seems odd to go to all the effort, and add $10 worth of components and complexity in order to protect a $2 capacitor. :)


In my tube supplies, I have a similar soft-start as what I posted above, and the RC on the gate keeps the B+ under 68% of it's max until about 10 seconds after the heaters are energized.  Heater inrush is controlled with an NTC on the primary (which tends to help all of the secondary rails simultaneously).


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