Hi,
I'm curious, is it logical to use industrial type iec inlet filters for class A Pass amps?
I read lots of threads and people says it ruins the sound!
Some people claims it does not matter at all.
Or, is it depends on the filter construction?
Cheers,
Sb.
I'm curious, is it logical to use industrial type iec inlet filters for class A Pass amps?
I read lots of threads and people says it ruins the sound!
Some people claims it does not matter at all.
Or, is it depends on the filter construction?
Cheers,
Sb.
A bit of history as to why Inlet Filters are used.
Back in the 70s and 80s, power stations supplying the power grid, started using the power lines to send signalling between sub stations, ( like plug in baby monitors). The signals were getting disrupted by noise coming out of switch gear, switch mode power supplies and other stuff that produced noise like older television line stages. The IEC filter stops the noise getting out and back into the mains grid.
If you have a power supply that is noisy, like most switch mode power supplies, three class X capacitors, (one line to neutral plus neutral and line to earth), are usually adequate to stop the noise as the source is a fairly high impedance. Noise coming in from the main grid is another matter, that is a very low impedance and required large components dissipating many hundreds of Jules of energy to stop the noise. Still an issue in large factories.
These filters have absolutely no effect on the performance of the equipment they supply with exception of slight attenuation in mains borne noise.
Back in the 70s and 80s, power stations supplying the power grid, started using the power lines to send signalling between sub stations, ( like plug in baby monitors). The signals were getting disrupted by noise coming out of switch gear, switch mode power supplies and other stuff that produced noise like older television line stages. The IEC filter stops the noise getting out and back into the mains grid.
If you have a power supply that is noisy, like most switch mode power supplies, three class X capacitors, (one line to neutral plus neutral and line to earth), are usually adequate to stop the noise as the source is a fairly high impedance. Noise coming in from the main grid is another matter, that is a very low impedance and required large components dissipating many hundreds of Jules of energy to stop the noise. Still an issue in large factories.
These filters have absolutely no effect on the performance of the equipment they supply with exception of slight attenuation in mains borne noise.
Thanks for your explanation.
Is it important to use high current rating filters for class A amps?
Is it important to use high current rating filters for class A amps?