K&K Audio / Lundahl Transformers

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24.183.136.252

In Reply to: RE: With large power transformers posted by KurtP on October 17, 2009 at 19:21:53

Well, there was definitely an increase in stray capacitance when the unused windings were grounded. I guess this wasn't a huge surprise, but now what to do about it. I took the simplistic idea that by grounding these unused windings, they were providing some degree of electrostatic shielding between primary and secondary, a good thing in my mind. As it turns out, the used 6.3V windings are also grounded on one end, so there is further benefit. Now I have a floating primary and non-grounded but referenced HV secondary with all other windings effectively grounded.

Of course, not knowing exactly how the windings are layered, there is no guarantee of performance improvement, but it makes me feel better. Really look forward to seeing how this improved power supply with all Lundahl iron works out. I need a quiet mechanical and magnetic supply with low RF hash. I'll keep updating with any significant findings.

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