Fuse replacement for Threshold SA/10e

turbogti · 14th June 2011, 01:43 PM

So I want to replace the fuse in the 10e. Any suggestions? Does Fuse affects sound quality? I did some researches, and seems most "audiophile" agrees Fuse will definitely make a difference.... comments?

Nelson Pass · 14th June 2011, 04:32 PM

It has a lot to do with where the fuse is located. If it's in series with the
signal path at the output of the amplifier, then there is more potential for
problems, but if it's in the power supply, the effects are going to be less by
virtue of the PSRR, the power supply rejection ratio of the circuit, that is the
ability of the circuit to ignore noise and distortion in the supply.

The issues with a fuse are two-fold. First, there is a subtle modulation of the
resistance value of the fuse which could be a source of distortion. The higher
the value of the fuse, the less the effect, and the longer the time constant
of the fuse (slow-blow vs fast blow) also has an effect.

As you reduce the potential for modulation in a fuse, you reduce the
protection it offers.

Second, the quality of the connection between the fuse and fuse holder can
be a source of distortion if the contact surfaces are dirty or oxidized.

turbogti · 15th June 2011, 03:40 AM

Hello Mr. Pass, thank you fro the explanation. That is very well explained!

I am planning to replace all the Rail Fuses and AC Fuses on the amps, as they looked like poorly made, and are very old.

14th June 2011, 01:43 PM	#1
turbogti diyAudio Member Join Date: Jan 2011	Fuse replacement for Threshold SA/10e So I want to replace the fuse in the 10e. Any suggestions? Does Fuse affects sound quality? I did some researches, and seems most "audiophile" agrees Fuse will definitely make a difference.... comments?

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14th June 2011, 04:32 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	It has a lot to do with where the fuse is located. If it's in series with the signal path at the output of the amplifier, then there is more potential for problems, but if it's in the power supply, the effects are going to be less by virtue of the PSRR, the power supply rejection ratio of the circuit, that is the ability of the circuit to ignore noise and distortion in the supply. The issues with a fuse are two-fold. First, there is a subtle modulation of the resistance value of the fuse which could be a source of distortion. The higher the value of the fuse, the less the effect, and the longer the time constant of the fuse (slow-blow vs fast blow) also has an effect. As you reduce the potential for modulation in a fuse, you reduce the protection it offers. Second, the quality of the connection between the fuse and fuse holder can be a source of distortion if the contact surfaces are dirty or oxidized.

15th June 2011, 03:40 AM	#3
turbogti diyAudio Member Join Date: Jan 2011	Hello Mr. Pass, thank you fro the explanation. That is very well explained! I am planning to replace all the Rail Fuses and AC Fuses on the amps, as they looked like poorly made, and are very old.

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