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Apples vs Oranges

Posted by Lew (A) on March 1, 2015 at 10:14:53

In Reply to: Should I use Schottky or Freds in lieu of my Vishay rectifiers? posted by banpuku on March 1, 2015 at 08:55:24:

Here is my input: "Vishay" is the name of the company that made the rectifier, whereas "Fred" (short for Hexfred) and "Schottky" are terms that refer to how the rectifier was made. (For all I know, Vishay may make hexfreds and schottky type diodes, too.) Hexfreds and Schottky rectifiers are both "superior" to ordinary silicon diodes, on paper. (You might want to do some reading on this subject.) But IMO, Schottky's are the best sounding solid state rectifiers currently available. I use them in my own amplifers and preamplifiers. The Cree brand are very reliable in my direct experience. Keep in mind, the differences in "sound" among these types are not huge. But if you use Schottkys, you do not need to bypass each rectifier with a high voltage .01uF ceramic capacitor, as is commonly done to get rid of hash with other type ss rectifiers.

Bear in mind that the forward voltage drop (Vf) for Hexfreds vs Schottkys is very different. Thus if you use either to rectify a filament supply, where the voltage is already low, you may find your filament voltage will be a bit higher than expected (with Schottky) or lower than expected (with Hexfreds).

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