The guru on fuses:
Fuses do NOT affect audio performance. They are a safety device. When will the audiophools stop fooling themselves and realize the exaggerated placebo effect ? Fuse is a very very small resistor on the supply line, whose value is almost no different from the rest of the copper supply wire it is in series with. Now please repeat after me, while slowly and repeatedly banging your head against a corner wall: God grant me the serenity to accept that a fuse does not ever affect the audio performance of an amplifier, the courage to admit to that and the education to understand what a fuse really does, together with the wisdom to know the difference. Repeat this about 10,000 times and maybe there will be some hope for you. |
Anyone who thinks a fuse changes the sound, suffers an inferiority complex, which manifests itself in them feeling superior to everyone else thinking they hear differences. That is the nature of psychological delusions. To them, it is real. They really ’hear’ it. The effect of delusion is very powerful.. But alas, to the rest of the people who live in the real world objectively, there is no difference. They do not have to prove their superiority by pretending they hear things nobody else is capable of hearing. |
bluemoondriver Fuses are tiny pieces of low value resistors which when heated to the correct temperature by excess current passing thru them, melt and avoid damage & a possible fire. They contribute ABSOLUTELY NOTHING to the sound. I just measured the resistance of 2 ’normal’ fuses: a 500 mA fuse had a resistance of 0.7 ohms. Meaning, that the power dissipation on it will be I^2 x R = 0.5 x 0.5 x 0.7 = 0.175 watts as it is about to blow. It means that the fuse will melt at such a very low power dissipation, when its limit current is reached. And the voltage drop across it at that current will be 0.5 x 0.7 = 0.35 volts. Absolutely negligible. This fuse is obviously for a very low current circuit. A second fuse I measured was for 8 Amps, more typical of a 2 x 200/250 watt 120 VAC typical amplifier. Its resistance was 0.3 ohms. This means it would dissipate about 8 x 8 x 0.3 = 19 watts. And the voltage drop across it at that current would be 2.5 volts just as it is blowing. Again totally negligible voltage drop. What makes them different is the melting point of the material used in them. Note that the one that passes 8 amps must withstand a dissipation of about 20 watts before it blows whereas the 500mA fuse is required to blow at only 0.175 watts. Note that I did not mention temperature. When a fuse is working at less than its maximum limit, it is obviously still dissipating power and is likely to get warmer/hotter. This typically will increase their resistance, meaning the power dissipation on them is likely to increase FASTER than I^2xR with increasing current, meaning they start actually dissipating more heat as they get closer to their blowing current. Here is a link which explains that relationship, towards the bottom of the page, which headlines "PTC characteristics", if you really want to understand them deeper: https://www.littelfuse.com/~/media/electronics/application_guides/littelfuse_fuseology_application_g... Basically, fuses HARDLY affect the currents passing thru them. They are almost ’transparent’ as they should be, not to affect any operating parameters in the rest of the circuit. Fuse believers are just hearing things which are not there. They need urgent help. |
bluemoondriver, Yes, negligible to voltage as well. A fuse is a current device. It reacts to the current flow in it. It is not voltage dependent. The only reason they MAY put a voltage rating on it is to make sure that you do not use it in a circuit which may be above its maximum INSULATION voltage, for safety. But its blowing parameter is ALWAYS in Amperes, not volts. Having said that, a typical device, assuming it can operate with multiple voltages, will usually draw HALF as much current when used with 240 Volts as it does when used with 120 Volts. So, if you are using .. say a 1200 watt power consuming amplifier, at 120 Volts, it will draw 10 amperes when operating at its maximum volume and will need a 10 amp fuse. When you take this device to the UK for example (assuming it DOES work there and has a voltage selector on it to allow that), the same device will now need only a 5 amp fuse, since it is now connected to 240 Volts. NONE OF THE ABOVE IN ANY WAY WILL AFFECT THE SOUND. IT IS ALL FOR SAFETY. |
