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DIY For Audio
Tweaking the Rotel RA935BX amplifier
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<blockquote data-quote="handsome" data-source="post: 800453" data-attributes="member: 772"><p>i once added a filter before a pair of 1N4007s in a valve amp (full wave rectifier) consisting of a 100nF cap across the two AC lines, a 10R W/W resistor in series with each line and finally a 10nF cap across the lines after the resistors. I got the circuit from a Sound Practises article i think. For solid state resistors should be 1R W/W. The difference in sound was very noticeable, cleaner and less er, graininess. The filter, i think, slowed down switching transitions and prevented transformer/diode interaction. Similar can be achieved by using a snubber after the rectifier. There is an interesting thread about this and optimum snubber values on DIYaudio somewhere....</p></blockquote><p></p>
[QUOTE="handsome, post: 800453, member: 772"] i once added a filter before a pair of 1N4007s in a valve amp (full wave rectifier) consisting of a 100nF cap across the two AC lines, a 10R W/W resistor in series with each line and finally a 10nF cap across the lines after the resistors. I got the circuit from a Sound Practises article i think. For solid state resistors should be 1R W/W. The difference in sound was very noticeable, cleaner and less er, graininess. The filter, i think, slowed down switching transitions and prevented transformer/diode interaction. Similar can be achieved by using a snubber after the rectifier. There is an interesting thread about this and optimum snubber values on DIYaudio somewhere.... [/QUOTE]
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DIY & Tutorials
DIY For Audio
Tweaking the Rotel RA935BX amplifier
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