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In Reply to: RE: IXYS DSEI HFA series freds or?? posted by sayntjack on March 14, 2016 at 23:24:04
You cannot mount large two lead diodes like you would a tiny one that sits on a board. If your part is sitting in the air and resonating on its two leads....you will hear this. Very bad. You must damp all diodes, large transistors, regulators, heatsinks, etc. or you get bad sound. Use EAR SD40AL damping material (available from Percy Audio) along the top or sides of all diodes or from the top of the diode to another part. Then use a little Amazing Goop around the part of the damping material where it is touching the part as the glue on the EAR material is not very strong. Amazing difference for the better when your parts are not resonating. Check out my oppo 105 mod page for pics of damped diodes and parts. Don't put damping material directly on the face of anything electrical (including diodes). Damping material is not a good dielectric....damp along the edges only.
Follow Ups:
Ric, The diodes in the PS are in the air if I remember correctly and are pretty big, at least 3A and round. So when I replace them with with rectangular diodes of much higher quality I will be able to damp them on the sides and have higher quality diodes. A double wammy improvement. Is it your opinion as seems to be Lews that going from likely general purpose regular diodes to diodes that have huge respect for improving sound quality would be inaudible in a 13.8 3A linear PS for a dac. "Not worth the angst". Going from junk diodes to about the best is a waste of time?? Tweaker
Edits: 03/15/16
I did not mean to be understood that way. I have no way of knowing whether upgrading the diodes in your PS will actually constitute an audible improvement. There is nothing wrong with trying it. However, what I did mean to say was that your angst over what audio quality diode to use was not worth it. You've changed your mind repeatedly which is a sign of anxiety over a trivial issue. (I know from personal experience.) UF or Schottky or fred should be fine. But since you asked, I would choose UF or Schottky over fred. Is this full-wave rectification or half-wave? If its currently half-wave, there might be something to be gained by going to full wave. (How many diodes are in the circuit?) Are there bypass capacitors across each of the OEM diodes (usually .01uF ceramic capacitors)? If you go Schottky, you don't need the bypass capacitors.
Excellent, thoughtful and useful response Ric. I like your observation to damp on the sides only to prevent bad effect from dielectric effect and the special importance since they will be hanging in mid air. This is the kind of anal retentive OSD thinking that leads to better and better sound. What I thought we were hear for? Thanks, Tweaker
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