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What is your experience with the standard diode in SS equipment replaced with an upgrade to Hexfred diodes?
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I would agree with the suggestions to use Cree Schottky diodes due to my good experience with these parts. They do need to be over specified in my experience, 1.414 peak voltage calculations will not be sufficient. My power amp needed close to 3x to be long term reliable. I have also heard suggestions that only one diode be used in series on the output of rectifier circuits, which makes sense to me, but I have never tried that configuration.
Mike
For me Cree's - for me-can be a little too bright in certain spots.Hexfreds can be a good balance.
I read long ago 3x the PIV voltage is minimum for long term reliability. The 600 volt diodes are great in the 40 to 80 volt SS amp & receiver circuits.
I also read Cree Schottky do not like high temps. Hexfred is more tolerant. Anyways, I use 1/2 size TO-220 heat sinks on both in the main power supply. I guess high power 100 watt and higher amps with a single power supply for both channels should use full size TO-220 heatsinks if room exists. I know some high power amps use two transformers.
I also see current de-ratings for Schottky diodes at higher temperatures.
With high current, high PIV schottky diodes now available, they become the clear first choice.
It called SIC Cree Schottky diodes. I used 600 volt 8 amp. The diodes only drop 1.1 volts at 3 amp current draw in most 50 watts amps. Higher wattage amps at up to 8 amps current drops 1.75 volts. Hexfred always drops 1.75 volts.
Schottky has high leakage and gets worst with temperature rise, thus must have heatsinks. (This is per a member at DIY Audio).
Apparently Hexfred has lower leakage. But, I have used both and use a 1/2 size TO-220 heatsink on either TO-220 diode.
Scottky has zero crossover distortion, Hexfred very low crossover distortion.
Huge improvement in sound. I have used these with excellent results and they get lots of respect out there in audiophile land. IXYS DSEI. IMO you should go as big as you can afford in terms of voltage and current.
"The party told you to reject the evidence of your eyes and ears. It was their final, most essential command." George Orwell-1984
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