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In Reply to: RE: Looking at the other end of things posted by pictureguy on July 13, 2021 at 16:02:29
Not all SS diodes are the same. Standard diode makes a lot of noise unlike a tube. Hexfred or CIS Schottky make little noise just like a tube. Yes, you can hear the difference.
Follow Ups:
I trust your opinion and enjoy reading your comments. So thanks for that.
Have you done, or know of any testing to see exactly what the REAL world effects are with various diodes in the PS. Are we talking about audible noise or some ringing in the 50kHz range?
Compared conventional diode to Hexfred and CIS Schottky. The Hexfred and CIS Schottky had a slightly, but noticeable quieter sound. All diodes feed extra large capacitors. If the caps were factory stock capacitance, the difference would have been larger.
I don't expect you to do it, but it would be interesting to see some scope tracings on an "average" stereo with and without low noise diodes. But who feels like taking that much time out of our week when we're talking about a difference of a few cents in diodes.
Conventual diode- 50 cents. Hexfred or CIS Schottky- $6.
I MANUFACTURED the HEXFRED while working for International Rectifier, prior to the sale to Infineon.It was a relitively quick process (number of steps).
It is or SHOULD be a commodity cheap product. 12x a conventional diode is ridiculous. The main
source of increase in cost is the EPITAXIAL Silicon used as start material....But each wafer held LOTS
of potential parts....And since the process was so simple, we got Very Good yield, indeed.
Don't let anyone tell you they are 'Expensive' to make or whatever. In-Fab yileds are high as are
probe yields. The MOST expensive part is the start wafer. We would start 'em 100 x 6" wafers at
a time. A single lot would yield THOUSANDS of parts. And require a fraction of the time and steps
used to make a MOSFET......or in our case.....a HEXFET device.
Too much is never enough
Edits: 07/28/21
I worked for a compamy that manufactued discrete devices.
I helped make more HEXFREDs than you could possily imagine.......
a 6" wafer held maybe 500 to 1000 usable die and each 'lot' was 100 wafers.
Being a simiple process, the yield was good......And resulted in what amounts to a commodity cheap product.
Too much is never enough
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