K&K Audio / Lundahl Transformers

RE: AC/DC heating with series feed

86.133.210.220

In Reply to: RE: AC/DC heating with series feed posted by KurtP on October 10, 2007 at 05:43:11

I guess youhave a choke input filter and the choke is ringing. You may to try either Morgans suggestion of 100nF caps to ground either side of the choke or the old fashioned 10nF and 1 to 10K across the choke. In my experience this fixes the ringing.

Have you tried getting rid of the regulator for the DC heaters? Replace it by a suitable wattage resistor - you may well be surprised and discover you prefer the sound. All regulators have an indictive output (their impednace rises with frequency). You could also try following the regulator with an RC network - say 3R3 and 100nF - this may well yield similar results.

Personally I use AC heaters in my power amp' but DC heaters in the pre-amp.

Hope this helps.

Andy

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RE: AC/DC heating with series feed - KurtP 07:14:46 10/10/07 (0)

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