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 KevinC on October 10, 2007 at 07:45:25

"It's a big deal to make a quiet DC supply for high current indirectly heated filaments and AC works very well."

You aren't kidding. I continue to be plagued by RF in my DC supplies, built with all the precautions.

My suspicion is this may be contributing to my listening fatigue. I'll try AC and see what happens.

Little more difficult to check the B+ noise with a lab scope, but that might be worth a check. Any ideas on how to best to that?

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