Bypass mur860 diodes with caps?

[300_baud]

Hi there,

I was wondering if bypassing the mur860 diodes was a good idea. I've actually already tried this with 680 pf caps on a LM3886 gainclone. The sound seems a lot more relaxed than before. Can someone verify this? Is this a good thing or not?

Thanks for your help,
300_baud

[Nuuk]

Somebody told me recently that using these snubber caps on the rectifier bridge is good for higher frequencies and not so good for lower frequencies.

[300_baud]

So what values are people using to bypass their diodes? Like i mentioned in my first post, I'm using 680 pf.

Thanks again

[w00t]

I'm using 0.1uF X2 caps (Rifa PME271M). They are surplus from my Quietline project.

[300_baud]

Well, just wanted to report that the sound opened up, especially the treble. The transparency is about the same now as how it was without the caps on the diodes. Even though it is as transparent as before the caps, the treble doesn't feel as "sharp and as hard hitting" as it used to, which to me is a good thing. It's like the frequency response in the upper frequencies is more linear now.

Anyone else want to report their findings?

[Nuuk]

So what values are people using to bypass their diodes?

22n.

[Peter Daniel]

I had MSR860 in a DAC and there were there 0.1u orange caps across each diodes. I removed the caps later and the sound became much cleaner. I prefer it without caps.

But it may be circuit/system dependant, so do whatever you prefer.

[carlosfm]

Why do I always have a feeling that bypassing rectifier diodes is injecting AC on the PSU?

[Mark25]

Originally posted by carlosfm
Why do I always have a feeling that bypassing rectifier diodes is injecting AC on the PSU?

i was on the understanding that there's no current flow through a Capacitor, and the bypassing caps have quite high reactance to anything other than rf, so not much of the 50Hz "should" be getting through.
Mark

[head_spaz]

is the AC operating at a higher frequency than the diode?