K&K Audio / Lundahl Transformers

RE: AC/DC heating with series feed

24.106.50.158

In Reply to: RE: AC/DC heating with series feed posted by AndyN on October 10, 2007 at 06:08:02

Yes, I have choke ringing, no question about it. Secondary of transformer is ugly, looks just like the book. I've tried Morgan Jones' method, to little avail. I also notice it takes a lot of capacitance (4 uF) across the choke to significantly change the ringing waveform. And yes, I am using the RC on the output of the regulator. Thought I was taking all the precautions, but so far the results have not been stellar.

As far as removing the regulator, I would say if I go DC, the regulator stays. I see little benefit in not regulating, after going through all the trouble of rectifying. Besides, my issue won't change if I remove the regulator; I'll still have RF hash.

The next few days I'll try to clean this up, but if I end up with no hum using AC heaters, why not? Certainly makes things easier.

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