tesla13BMW Posted May 7, 2017 Share Posted May 7, 2017 (edited) How do I calculate the chokes to use in the above power supply to minimise power supply noise? The power transformer is a 230V CT at 0.22A. What current rating should the chokes be? OR should I just use the resistors? This will be powering a valve active crossover using ECC88 valves and DC supply to the heaters. Cheers, Chris. P.S. More info can be found here http://www.pmillett.com/tube_active_crossover.htm Edited May 7, 2017 by tesla13BMW Spelling Link to comment Share on other sites More sharing options...
tesla13BMW Posted May 7, 2017 Author Share Posted May 7, 2017 Don't know where the picture went. Link to comment Share on other sites More sharing options...
tesla13BMW Posted May 7, 2017 Author Share Posted May 7, 2017 I have attached the schematic.new_xover_sch.pdf Link to comment Share on other sites More sharing options...
Andrews_melb Posted May 10, 2017 Share Posted May 10, 2017 Have you searched diyaudio.com they normally have heaps of info? I cant remember how its done either but have replaced resistors with chokes in two tube amps with no issues. You should be able to google this easily, those pete millet designs seem to be well thought of Link to comment Share on other sites More sharing options...
tesla13BMW Posted May 10, 2017 Author Share Posted May 10, 2017 I have searched, but, found very little about calculating what is required. I've tried modelling a single B+ supply using PSU designer II from Duncan Amps and things just don't make sense i.e. less voltage using chokes when everything I read says there should be more voltage. Doesn't seem to reduce the ripple either terribly much compared to using resistors. The reason for wanting to use chokes is that I want the power supply to be as electrically quiet as it can be while minimising heat. Link to comment Share on other sites More sharing options...
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