Replace rectifier diodes in Tubeamp

titian · 23rd September 2010, 04:14 PM

My 6 Tubeamps (mono) have four plus one 1N4007 and four 1N5408 in the power supply circuit. Since I want to have over here spare parts in case I need them I'm going to oder some.
I came to know that there are people who hear sound differences when using "faster" diodes.
My question is would you order faster ones (UF4007 and UF5408 for example) for expecting better / different sound quality? If yes which ones would you consider. I read also about the MUR860 or MSR860.
Interesting is that the 1N4007 are used in the amps while on the schematics 400 V 1A is written.
The prices of faster ones are rediculous comparing them to other parts so choosing faster ones will not affect financial issues.

Since I will also order the 1N5388A, 1N5386B and 1N5384B I would like to know what replacements are there for these parts which would impact the sound.
Please note that I don't want to change anything about the amp concept.
I have very little knowledge in electronics but I already fixed the amps and replaced the coupling capacitors as example.

SY · 23rd September 2010, 05:03 PM

Quote:

My question is would you order faster ones (UF4007 and UF5408 for example) for expecting better / different sound quality?

I would, since the price of a better component isn't too significant. Whether or not a difference is audible will depend very much on the specific circuits (both power and signal) and your layout/grounding. But going high speed is cheap and can't hurt.

titian · 23rd September 2010, 05:21 PM

Then the MSR860G instead of the 1N4007 if the information on the schematic is right (400V 1A).

For the 1N5408 I should then use the MUR4100EG? I haven't found any MSR for 1000V 3 A.

SY · 23rd September 2010, 07:53 PM

Why go to a lower voltage? Higher voltage and current ratings than spec aren't a problem.

titian · 8th November 2010, 10:22 AM

I decided I will replace the 1N4007 with a SF4007.

Can I replace the 1N5408 with a SF5408 or are they not compatible? Is there anything I must be aware of?

23rd September 2010, 04:14 PM	#1
titian diyAudio Member Join Date: Feb 2007 Location: Oberarth	Replace rectifier diodes in Tubeamp My 6 Tubeamps (mono) have four plus one 1N4007 and four 1N5408 in the power supply circuit. Since I want to have over here spare parts in case I need them I'm going to oder some. I came to know that there are people who hear sound differences when using "faster" diodes. My question is would you order faster ones (UF4007 and UF5408 for example) for expecting better / different sound quality? If yes which ones would you consider. I read also about the MUR860 or MSR860. Interesting is that the 1N4007 are used in the amps while on the schematics 400 V 1A is written. The prices of faster ones are rediculous comparing them to other parts so choosing faster ones will not affect financial issues. Since I will also order the 1N5388A, 1N5386B and 1N5384B I would like to know what replacements are there for these parts which would impact the sound. Please note that I don't want to change anything about the amp concept. I have very little knowledge in electronics but I already fixed the amps and replaced the coupling capacitors as example.

23rd September 2010, 07:53 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Why go to a lower voltage? Higher voltage and current ratings than spec aren't a problem. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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23rd September 2010, 05:21 PM	#3
titian diyAudio Member Join Date: Feb 2007 Location: Oberarth	Then the MSR860G instead of the 1N4007 if the information on the schematic is right (400V 1A). For the 1N5408 I should then use the MUR4100EG? I haven't found any MSR for 1000V 3 A.

8th November 2010, 10:22 AM	#5
titian diyAudio Member Join Date: Feb 2007 Location: Oberarth	I decided I will replace the 1N4007 with a SF4007. Can I replace the 1N5408 with a SF5408 or are they not compatible? Is there anything I must be aware of?

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