| meat |
| I was wondering why the MUR860 diode is used in the Gainclone and not something more efficient like a Schottky diode or even MUR840 or MUR820? Isn't the MUR860 overkill for the voltages that are present in a Gainclone? |
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| carlosfm |
Why not the MBR16100?
I like them too.
The MUR860 gives good results, but you're free to try other things. |
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| Nuuk |
It was Peter Daniel who first suggested the MUR860 after 'listening' to other diodes in his GC's.
I used it based on PD's recomendation and the sound of my GC's has always been so good that I am loathe to change the 'recipe'. ;)
I dare say there are amny other diodes that will do as good a job or even a ready built rectifier bridge. |
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| Peter Daniel |
MUR860 came up by accident; I just had some samples on my shelf and didn't think twice about using it in my first GC amp. It was at the time when I didn't believe much that diodes affect the sound.
Later, I did some comparisons, but at the time didn't test MUR860. The one that I liked the most was MUR1520 and I used it in the second amp. I took the amps for some listening comparisons and for some reason the second amp didn't sound as good as the first one, although they were identical. Eventually, we checked PS and we found out that the first one had the infamous MUR860 installed. So far I didn't come across a better sounding diode. I use it in a preamp as well and it sounds very good. I also use MUR860 in a DAC supply and MSR860 in receiver supply. It's been suggested that MSR should sound even better, but after some tries I found it to sound too bright, it is better in digital circuits though.
It's been reported that original GainCard is using FE5D diodes. I didn't have the chance to evaluate them, but maybe someone else would? |
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| falcott |
I was speaking yesterday to a tech at Arrow Components about the MUR860 from ON Semi. He tells me that it is all but obsolete, and is superceded (or so it is recommended) by MUR880E. Anyone else heard about this?
Now, a couple of questions. I am about to order a handful of diodes for future comparisons in a GC. I understand that Peter liked the Motorola MURs. Are they still available? I have yet to ask Farnell, from whom I am getting a lot of my stuff.
And Carlos likes the MBR16100. Has anyone tried the MBR10100, or compared them? I have some coming from ON Semi.
:scratch2: |
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| falcott |
It may not be news to some, but I was told today by a Farnell tech that both ON Semi and Motorola MUR860s are from the same source. Farnell have them in stock also.
I've ordered from ON a handful of samples, several types of rectifier diodes; just waiting now on delivery. :D |
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| jean-paul |
ON Semi is a spinoff/subsidiary of Motorola AFAIK so it would not surprise me if the parts are one and the same.
edit: I just checked and the company separated from Motorola in 1999 but still has close ties with it.
http://www.businessweek.com/bwdaily...000/sw00620.htm |
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| Peter Daniel |
Actually, the original MUR860 that I tried were from Motorola. But I couldn't source them in large quantity from Motorola, so I settled on OnSemi. It is indeed probably the same part, as it sounds very similar (maybe even better) and looks almost the same.
I alsoo tried MUR860 from Fairchild (available through D-K) and was disappointed with a sound. It sounded much harsher and I wouldn't use it. |
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| Anorgan |
| What would you think of MBR 745? |
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| demogorgon |
I see the mu860 is used by a lot of "pro" GC builders.
Unfortunatly thet are not availble from elfa.se, where i'm ordering the rest of my parts. however the mur820 is.
are there any big differences from the 860?
i altso am thinking about the mur1520, 1620CTr 2020CT
the last two are dubblediods.
regards
marius |
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| slawney |
The Schottky SB560s are excellent at low PSU voltages if you add a bleeder across the secondaries to prevent transformer ringing. I tried MUR860-types (never MUR 860 itself), but the Schottkys sounded better to me. Worst in GC application were some FRED diodes, which admittedly sound better at higher voltages.
Also, the FE5s in the original Humpty are well chosen ;) |
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| nkwenti |
Hi i just need help with these transistors mje350/340 coz i cant find them that easy
I will be happy to recieve some other types to use in place of these specs
Thank`s
dnkwenti@gmail.com |
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| peranders |
| quote: | Originally posted by meat
I was wondering why the MUR860 diode is used in the Gainclone and not something more efficient like a Schottky diode or even MUR840 or MUR820? Isn't the MUR860 overkill for the voltages that are present in a Gainclone? |
Efficiency is hardly the issue here. |
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| filholder |
I built my AD815 preamp using MBR10100 since Rudi suggeted they were more detailed than the MUR860's. I personally dont know if they do however the preamp does sound excellent with them so are probably worth a try.
Phil |
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| Upupa Epops |
| Sound of diodes at PS ? And it is hearable with quasicomplementary amp ? :xeye: I'm wailing.... |
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| tinitus |
I have used 30EPH06 "Hyperfast/soft" from IR (i think) - so it should be really fast (?)...and soft - and its sounds this way too
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| percy |
| quote: | Originally posted by meat
..or even MUR840 or MUR820? Isn't the MUR860 overkill for the voltages that are present in a Gainclone? |
the MUR820 has better capacitance and forward voltage drop than 840 and 860, yet, like you, I too have yet to understand why 860 is the 'popular' choice around here..:scratch: |
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| Eva |
The truth is that most people is using MUR860 just because they saw other people do so and because the TO-220 shiny cases with heatsinks look fancier in their PCBs, but without even understanding ultrafast diodes.
From my point of view it's quite funny to see that happen, because I usually do SMPS stuff and I routinely use most of these diodes in demanding circuits where a standard recovery diode would explode or cause something to explode (that's why ultrafast ones were invented), but for slow 50/60Hz rectification I still use conventional diodes with RC damping networks, because objectively speaking they give very good switching performance and lower dissipation. |
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| N-Channel |
| quote: | Originally posted by falcott
And Carlos likes the MBR16100. Has anyone tried the MBR10100, or compared them? I have some coming from ON Semi.
:scratch2: |
I have used both the Motorola and newer OnSemi MBR10100s in many SMPSs for Audio Applications. I can find no discernible difference between the two. I do like their lower forward voltage drop as compared to their ultrafast counterparts.
Steve |
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| cpemma |
| quote: | Originally posted by Eva
The truth is that most people is using MUR860 just because they saw other people do so and because the TO-220 shiny cases with heatsinks look fancier in their PCBs, but without even understanding ultrafast diodes.
From my point of view it's quite funny to see that happen... |
My usual supplier sells the fast-recovery BYW80-200 at £0.54; googling for a datasheet I spotted the same diode at £2.35 at an audiophile shop. I can't call snake-oil, but it does show how ready the specialist shops are to cash in on a trendy hyper-fi item. |
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| wrenchone |
Even "normal" recovery diodes can cause a lot of broadband RFI when used with a capacitive input filter. The diodes are forced to recover into a voltage source (the charged filter cap), so there can be a substantial reverse recovery transient. I see the effects of this all the time when performing EMI testing on switching power supplies. The signature of this noise is a broadband continuum that rises with decreasing frequency, and is especially prominent down at 150-200kHz. The noise can be substantial all the way down to 10kHz. The reverse recovery current pulses can also interact with stray inductance and capacitance in the current path and cause ringing, enhancing noise production. Changing the normal recovery diodes to glass passivated diodes with a guaranteed 2us trr brings down the noise quite a bit. This is the rationale behind using an ultrafast or Schottky rectifier in a 60Hz circuit. However, if the diodes are not properly snubbed, the problem area just gets shifted to a higher frequency. At the same time, though, the reverse recovery spike for an ultrafast diode will be much smaller and faster than with a normal recovery diode, and hence more easily damped with a snubber.
I generally use whatever ultrafast diodes I have on hand, and damp them with a combination of ferrite beads and RC snubbers. |
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