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In Reply to: RE: Yes, thanks... posted by sherod on October 01, 2016 at 21:36:01
I'm curious if this diode would be a drop-in replacement for a Fairchild Stealth 4A 600V diode. Both have the TO-220 package.
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if both parts have the same Voltage and Current ratings? The only reason it might be a problem is if you are going to use the diode in a low voltage supply, where the forward voltage drop of one diode type vs another can make a difference in the output voltage of the supply as a whole. Typically a Schottky will have a lower Vf than other types, which might raise the voltage fed to a regulator by 2-3 volts overall. If we are talking about a tube circuit with hundreds of volts in B+, no problem. In a filament supply of a tube device or for a solid state device with low voltages, changing to Schottky COULD be a problem but likely not, because raising the unregulated V by a few volts is usually not a problem, if you're going to regulate it, whereas lowering it could be.
On my TU-717 power supply, there are three diodes at D01,D02 and D03. The first two diodes(D01,02) were previously replaced with IXYS Hexfred type and D03 was the factory diode that has 10D written on it. I only replaced D03 with a 11DQ10 Shottky, but the sound got worse. I put the stock diode back in and the sound opened back up. Must have been a voltage issue. I'm leaving this particular power supply alone for now. I don't think I can get it to sound any better than it does now. On to the next project.
Good reminder Lew. Not a bad idea to do the math on that based on the reg. and input voltage . Forgot about that. I did the math on my project and the Schottky would have been fine. Didn't use one though. Since you like Schottky's better than soft recovery maybe you can suggest what specific device you liked to Sherod in case he wants to do the comparison. It seems to me that an experienced opinion might be better than getting a random device from ebay. I don't think there was a brand listed on the ebay one. Tweaker
to me a Schottky is a Schottky; I've never compared brands. Likewise, for a UF or Stealth type. Funnily enough, the only thing I can say for sure is that I heard a definite difference in favor of Schottky when I replaced IXYS Hexfreds with Schottkys, in both a preamplifier and in amplifiers. Not night and day, but a bit better, less hi-fi-ish, with Schottkys. These observations are so tenuous that I would normally not mention it.
" In the instances I've used schottky instead of soft recovery, the perceived result is a "darker" background and smoother, even slightly rolled-off top. This is very noticeable with power supplies for cd players, where obviously these are pretty positive factors (esp. lack of "digital" signature). Haven't tried the latest technology schottkys, but I expect they will be good too."
I've never bothered to replace rectifiers in an SS device like a CDP. My experience is limited to tube audio. However, if one does such a thing, one ought to be aware that the resulting change in voltage, even though small, may account for the perceived difference in sound.
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