Tweakers' Asylum

Just be sure caps are rated for at least 250 VAC.

76.191.156.247

Al Sekela

In Reply to: RE: Al Sekela's R/C network - recommended values for 220V AC posted by Baki on September 30, 2008 at 04:10:10

All the X- and Y-rated caps I've seen are rated for at least 250 volts AC, and many are rated for 275 VAC or higher. This is to allow them to be used in regions with 220-240 VAC mains. However, there may be some out there that are only rated for 150 VAC.

IME, the Wima metallized paper capacitors give the best sonic performance. You may want to experiment with resistor values.

Follow Ups:

RE: Just be sure caps are rated for at least 250 VAC. - Baki 23:40:08 10/01/08 (2)
Many thanks Al,

Do you suggest the same range of capacitance and resistance as for 115V AC?

Goran
- As a starting point... - Al Sekela 15:38:08 10/02/08 (1)
  yes.
  
  There will be some optimum resistance value that depends on your caps and your mains cable The best way to find it is through trial-and-listen.
  - RE: As a starting point... - Baki 04:56:33 11/26/08 (0)
    Well, Al, this tweak is not marginal but substantial :)
    
    A Little change in resistor value can lead into some kind of oscillation with even unpleasant sound.
    
    I can confirm that Wima MP3 0,47uF is audibly better than, say, Arcotronics MKP X2 of the same value.
    
    Some say that increasing the value of capacitor achieves further benefit.
    
    I am currently using 0,47uF/110R values.
    
    Al, if I change the capacitor for the 1uF one what should be a starting value for the resistor?
    
    Have you tried some costly audio capacitors in that position (auricap, mundorf...)?
    
    Thank you for your support.
    
    Baki

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