I had a similar experience. While modifying Marantz CDP, I remove the original rectifiers (marked as WO6B in a schematic) and installed MUR860 hoping for improvement. Well to my surprised the circuit sounded so bad (bright and edgy) that I quicly put the original diodes back in.
But from whatever I tried so far in GC, MUR860 is still best sounding to me.
But from whatever I tried so far in GC, MUR860 is still best sounding to me.
to just add some sanity to this, here is a link to Rod Elliot's article on power supply.
http://sound.westhost.com/power-supplies.htm
it contains a referrence by Nelson Pass on the need to slow down the standard diodes for audio applications.
so your basic choice is to either believe Nelson Pass / rod elliot or Peter Daniel, anaalog-sa, or a marketing brochure from midrigal.
To me, the answer is too obivious.
http://sound.westhost.com/power-supplies.htm
it contains a referrence by Nelson Pass on the need to slow down the standard diodes for audio applications.
so your basic choice is to either believe Nelson Pass / rod elliot or Peter Daniel, anaalog-sa, or a marketing brochure from midrigal.
To me, the answer is too obivious.
this is one of those things that when their advocates cannot find empirical data in favor of them, they bring out the favorable theoritical "pieces".
when their theories cannot work, they resort to "I heard" argument.
Consistency and science have never been the strong point of this type of "high-end" audio.
when their theories cannot work, they resort to "I heard" argument.
Consistency and science have never been the strong point of this type of "high-end" audio.
fdegrove said:Sorry to say so but you're definetely wrong on this one.
Cheers,
I felt coming from you it is a complementory to be wrong,
fdegrove said:it does NOT say what you think it says.
Cheers,
I am sure you know very well what I think before I tell you such.
What other supernature capabilities do you have?
millwood said:
Millwood, the performance differences between diodes used in standard 50/60Hz bridge rectifiers are well understood and documented. This forum has had several notable threads on the subject (most of which seem to have died out).
For real measurements see 'Measured RFI Differences Between Rectifier Diodes in Simple Capacitor-Input Power Supplies' by Rick Miller, pp. 26-27, Audio Amateur, One 1994. As far as I know Tektronix spectrum analysers aren't noted for their subjective qualities or golden ears.
Upupa Epops - your AP doesn't measure up in the r.f. bands but your semiconductors will certainly rectify/demodulate this noise.
Don't ask me to post the above article - if you want it send a few dollars to www.audioxpress.com It was around a long time before the internet became popular and deserves support.
James
millwood said:fdegrove said:Sorry to say so but you're definetely wrong on this one.
Cheers,
I felt coming from you it is a complementory to be wrong,
fdegrove said:it does NOT say what you think it says.
Cheers,
I am sure you know very well what I think before I tell you such.
What other supernature capabilities do you have?
I suggest you get back to the main topic and avoid further comments of this type How will be better value of SNR, when you use soft recovery diodes - 1 or 2 dB ? I mean that it will be lower . From about 120 dB of SNR is all unnecessary, 'cos we " hear " practicaly " silence ", isn't true ? But if is construction wrong and amp have hum, somebody is maybe " hunting " every posibility of improvement.
Upupa Epops said:
There is a big difference between 'hum' - usually mains frequency interference / grounding issues and rf interference. I didn't say it would make the amps sound better or indeed significantly affect the SNR. I was merely refuting the statements that it was subjective and not measurable. Rick Miller reported a decrease in rf on the power supply rail in the range of 10-20dB in the frequency range 10kHz to 1.8 MHz when changing from 1N4002 to other types.
On purely technical grounds this seems to me to be worthwhile.
James
Upupa Epops said:To nemestra : More then 124 dB was measured with " A " filter, without filter ( up to 500 kHz ) it was 118 dB - it is not enough ? If I will be dolphin, maybe it will be interesting for me
It's probably enough. But this a DIY board, and diodes aren't expensive and produce a measurable difference.
I would like to see someone produce comparable plots for power amp diodes such as MSR860 and MUR860. Unfortunately I never seem to get the time to do it...
James
So, will these IXYS be any good for audio rectifier? Also, does package size matters (I am thinking of cooling here)?
http://www.ixys.com/96509.pdf
http://www.ixys.com/96509.pdf
This was directed to Upupa and was still on topic. I was actually stating a fact which you actually confirmed. Your comment to Frank had completely different character. The way you start posting will surely get the thread off topic.
The main subject here is "Rectifiers for the GC", so if you have any sensible observations, you are welcome to comment, but don't try discussing "supernature capabilities" of other members.
You can consider this as a serious warning from a moderator
The main subject here is "Rectifiers for the GC", so if you have any sensible observations, you are welcome to comment, but don't try discussing "supernature capabilities" of other members.
You can consider this as a serious warning from a moderator
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