Rectifiers replacement in Nad3020

Calamaro · 13th March 2009, 12:21 PM

I would like to replace rectifiers in an old Nad 3020 (they are 1N5401).
I found no Schottky with correct characteristics so I wonder if some of the following should be an improvement:

UF5408 (ultra fast recovery)
FR304 (fast recovery)
MR854 (fast recovery)
RG3G (glass passivated fast switching recovery).

Thank you for any suggestion.

infinia · 13th March 2009, 03:52 PM

Why does "fast rectification" indicate good audio quality?
It ACTUALLY creates more "snap off" current transient combined with parasititIcs to create RFI hash. Requiring the use of snubbers and more bypassing to tame.

fjr · 13th March 2009, 04:29 PM

1N540... series is perfect for a such amp PSU. Keep them.

Calamaro · 14th March 2009, 08:52 AM

It's a suggestion I've read often in the forum: "improve PSU with fast recovery rectifiers"...

infinia · 14th March 2009, 01:51 PM

Hi
This has been discussed many times around here. see example thread Best diodes for generic power supply

IMO and that of 99% of designers of high end audio gear is that standard diodes are best at line rectification.
Novice psuedo designers and tweekers alike select exotic fast diodes (after all faster must be better) because it gives them some feelings that they have discovered some new magic. They point to hearing tests instead of scopes and spectrum analyzers.

13th March 2009, 12:21 PM	#1
Calamaro diyAudio Member Join Date: Mar 2008	Rectifiers replacement in Nad3020 I would like to replace rectifiers in an old Nad 3020 (they are 1N5401). I found no Schottky with correct characteristics so I wonder if some of the following should be an improvement: UF5408 (ultra fast recovery) FR304 (fast recovery) MR854 (fast recovery) RG3G (glass passivated fast switching recovery). Thank you for any suggestion.

13th March 2009, 03:52 PM	#2
infinia diyAudio Member Join Date: May 2005 Location: Californication	Why does "fast rectification" indicate good audio quality? It ACTUALLY creates more "snap off" current transient combined with parasititIcs to create RFI hash. Requiring the use of snubbers and more bypassing to tame. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

14th March 2009, 01:51 PM	#5
infinia diyAudio Member Join Date: May 2005 Location: Californication	Hi This has been discussed many times around here. see example thread Best diodes for generic power supply IMO and that of 99% of designers of high end audio gear is that standard diodes are best at line rectification. Novice psuedo designers and tweekers alike select exotic fast diodes (after all faster must be better) because it gives them some feelings that they have discovered some new magic. They point to hearing tests instead of scopes and spectrum analyzers. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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13th March 2009, 04:29 PM	#3
fjr diyAudio Member Join Date: Feb 2009	1N540... series is perfect for a such amp PSU. Keep them.

14th March 2009, 08:52 AM	#4
Calamaro diyAudio Member Join Date: Mar 2008	It's a suggestion I've read often in the forum: "improve PSU with fast recovery rectifiers"...

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