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Old 19th March 2013, 03:11 PM   #1
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Default Best SiC rectifiers?

What is the best-sounding SiC rectifier you have heard?

Not "bridge" rectifier - just, rectifier.

We tried some $1.06 Cree SiC rectifiers in our power supply and it sounded pretty bad -- weird treble problems -- not as good as our old trusty Hexfreds.

-Hukk
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Old 19th March 2013, 04:03 PM   #2
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Default Unexpected!

How odd! This is the last thing I would have expected, HF should be if anything cleaner than all other SS rectifiers, I was about to order two types for my first tryout with SICs. Sick SICs, I can't imagine what the problem might be.
RC
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Old 19th March 2013, 04:36 PM   #3
jcx is offline jcx  United States
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why give any creedance to anything the has op said so far? - no circuit, no measurement, no description of anything - just raw assertion of "sound"
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Old 19th March 2013, 05:36 PM   #4
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Not sure what the suspicion is all about, but we used them in a power supply for a tubed home stereo preamplifier. The circuit calls for 4 of them, 2 prior to the power supply capacitors, and 2 after. The power supply is brand new and very unusual, however, the SiC rectifiers were performing typical AC to DC duty.

We used 1A Cree schottky rectifiers. Maybe the 1A was too low.

The preamp sounded bad, so we replaced them with Hexfreds and it went back to sounding good again, with no weird problems in the highs.

So, just wanted to see if others have had this problem -- maybe somebody would say "oh those cheap Cree's. . . no good . . . you have to get the ________ kind" ?

Last edited by hukkfinn; 19th March 2013 at 05:42 PM.
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Old 19th March 2013, 07:05 PM   #5
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Just ordered a set of 8A, 650V Infineon SiC rectifiers . . . will report back after we try them.

-Hukk
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Old 19th March 2013, 07:34 PM   #6
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Quote:
Originally Posted by hukkfinn View Post
The circuit calls for 4 of them, 2 prior to the power supply capacitors, and 2 after.
That indeed sounds weird.

Besides, if changing one type of SS rectifier against another and it makes your amp sound "really bad", there is something seriously wrong with that amplifier circuit. Or with your ears and your imagination.

Andreas
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Old 19th March 2013, 07:52 PM   #7
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Originally Posted by Rundmaus View Post
if changing one type of SS rectifier against another and it makes your amp sound "really bad", there is something seriously wrong with that amplifier circuit. Or with your ears and your imagination.

Andreas
Thanks for your reply. Your observation is incorrect in this case, as there is nothing wrong with the amplifier circuit, or my ears, etc.

Please note that I didn't say anything sounded "really bad," so I'm not sure what you're quoting there.

If you have used any SiC non-bridge rectifiers that sounded good, I would still appreciate knowing which ones they were. So far, the advice I have gotten led me to the 8A Infineons but I'm open to others as well.

Cheers,
Hukk

Last edited by hukkfinn; 19th March 2013 at 07:56 PM.
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Old 19th March 2013, 08:31 PM   #8
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Quote:
Originally Posted by hukkfinn View Post
We tried some $1.06 Cree SiC rectifiers in our power supply and it sounded pretty bad -- weird treble problems --
I didn't know that the difference between 'really bad' and 'pretty bad' is so large.

And again, if the choice of rectifier changes the sound of your amplifier more than just marginally, there is something seriously wrong with that amp, or more probably, with its power supply.

Andreas
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Old 19th March 2013, 09:11 PM   #9
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It is the transformer rectifier combination that can ring. So just changing rectifiers can give quite interesting results. one turn off time may be very close to the resonance of the transformer and the other a bit away.

You might try adding an RC network across the transformer secondary.
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Old 19th March 2013, 09:30 PM   #10
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A schematic might help to find the cause of audible differences. Especially with respect to the unusual diode placement described above: "Two before and two after the power supply caps". Whoot?

Andreas
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