capacitor replacement 4700pf polystyrene

[psoul]

Hi All

i'm new here and a newbie in music fanatic repair
so i have an old emu sp1200 and i sometimes here hiss from a couple of outs (it's al old 1987 sampler with 8 outs)

i open and know the prob is a polystyrene 4700pf capacitors, it worls but sometimes it makes hiss
i need a replacement, check for styroflex and it seems ok, but my question is: which voltage? the service manual doesn't say anything than 4700pF plas. and there's no info on the capacitors itself (4700H ASC)
could u suggest me some good capacitors to make the change and which Volt do i need? i don't know maybe i can check with a multimeter and the machine on, but before i need some info... sorry for the ABC stupid question...




tnx

[SY]

Check the supply rail voltages. As long as the cap is rated for that or higher, you'll be fine.

[impsick]

I'll bet any polystyrene cap you get will be more then enough voltage. They are usually 160v and up. Other wise i guess find the highest volt electrolytic on the board and maybe double it to be safe.

[psoul]

thnx both!

so i think a 160v it could be ok.... this is a picture take from the service manual
so i think i'll move to a styroflex 4700 pF H or similar....

[impsick]

you ought to just replace all the lytics. you said it's from the 80's right? those film caps are a lot less likely to fail.

[psoul]

i would like to replace the 2 caps i have prob...

i know it's that the prob cause it's a common sp1200 emu problem and every time i touch them with the hiss and the sampler on i can stop the hiss....
i already reflow the solder but i think it's the capacitors is going to dye....