Members xOriginalNinjax Posted December 21, 2009 Members Share Posted December 21, 2009 Had a quick question. I just got a tube guitar amp (Valveking 112) and have to replace a capacitor. The rating on it was .1uF with 310v, 275v, and 250v all listed as voltage. The only cap I could find locally that was close was a .1uF with 250v max, and I checked the items list from Peavey and it has it listed at .1uF with 275v...which I can't find ANYWHERE...will the 250v work? It's for the universal power breakaway right between the wall plug and power transformer (page 8, upper right corner of this schematic) I appreciate it. I don't think it will be rate high enough...but maybe you can give me another idea. Link to comment Share on other sites More sharing options...
Members guitarcapo Posted December 21, 2009 Members Share Posted December 21, 2009 I'm not an electrical engineer...but I have an idea for you: Basic physics states that capacitors work opposite from resistors in that: Running two in parallel doubles capacitance (it HALVES total resistance when dealing with resistors)... and running two in series HALVES capacitence (it doubles resistance when dealing with resistors) ...assuming you are combining two equal resistors or caps: Which begs the question: "Why would anyone want to ever run two caps in series if you get half the capacitance?" It's because when you run two caps in series you DOUBLE the voltage they can handle. I guess what I'm suggesting is that if you can't find a .1uF cap rated at a high enough voltage...you might consider running TWO .2uF caps in series which would in effect create a .1uF cap rated at 500 volts. Any amp techs care to commment? Link to comment Share on other sites More sharing options...
Members knucklefux Posted December 21, 2009 Members Share Posted December 21, 2009 yeah, you're right...two .2uF 250V caps in series would effectively be a .1uF 500V cap. whether the 250V cap will work just depends on the voltage that is applied to it. Link to comment Share on other sites More sharing options...
Members wolfeman1982 Posted December 21, 2009 Members Share Posted December 21, 2009 You'll be fine. That capacitor isn't even necessary anyway. If you were running on 230v mains, then it would be close to the max rating if for some reason you got a surge. But if you are on 110v (USA) then you'll be fine with the 250v cap. Link to comment Share on other sites More sharing options...
Members the_bleeding Posted December 21, 2009 Members Share Posted December 21, 2009 just replace it with a mallory 150 series. Theyre all 630v. Link to comment Share on other sites More sharing options...
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