......Very small amounts of noise that manage to get through the supply also should have no effect on an amp, and if the amp is so afflicted, the remedy is the same as for ripple. Remember that at all audio frequencies, the reactance of the capacitor is very low, and will act as a short circuit for any stray noise signals. A 10,000uF cap has a theoretical reactance (impedance) of 1.6 milliohms at 10kHz. This will never be achieved in practice - the wire has more resistance than that. Suffice to say that the impedance is pretty low, and it is extremely hard for any appreciable signal to get past the filter capacitors. The addition of one or more 1uF film type bypass caps ensures that impedance stays low even as the inductance of the electrolytics starts to have an influence.
The above assumes that the problem is noise, but this is rarely stated as the "improvement" - it is more likely to be bass "authority" or extension, or perhaps the "veil" is lifted from the highs. It can readily be demonstrated that as long as a power supply is well engineered in the first place, the "quality" of the DC output is unaffected by any of the "remedies". Ripple voltage will remain the same, amplifier power output (at all frequencies) will be unchanged, and mostly the signal to noise ratio will be unaffected. It is very easy to monitor the supply rails with an oscilloscope and a monitor loudspeaker (capacitively coupled of course), and from this it is possible to directly assess any difference should it exist.....
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The above assumes that the problem is noise, but this is rarely stated as the "improvement" - it is more likely to be bass "authority" or extension, or perhaps the "veil" is lifted from the highs. It can readily be demonstrated that as long as a power supply is well engineered in the first place, the "quality" of the DC output is unaffected by any of the "remedies". Ripple voltage will remain the same, amplifier power output (at all frequencies) will be unchanged, and mostly the signal to noise ratio will be unaffected. It is very easy to monitor the supply rails with an oscilloscope and a monitor loudspeaker (capacitively coupled of course), and from this it is possible to directly assess any difference should it exist.....
FROM
) трубочным кондюком в 12пФ - сказал он мне.