ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
In my BeoMaster 700K I have to replace the big capacitor sitting next to the power supply. It is:
I am looking for a replacement of the same size as the original.
anyone who can recommend me a good source / webshop for big size capacitors?
Not easy without going far to high in working voltage - which is absolutely not good.I suggest fitting a new capacitor to the original bracket using a couple of crossed cable ties.
Don't fit a low-ESR type. That would be asking for trouble in this Beomaster.Grab a good quality general purpose one.
Martin
I always thought it was safe to use the specified voltage of a capacitor as a minimum. Therefor I was thinking about a capacitor of 1000uF but with a higher voltage than 50v (which is specified in case of the 700K). But anyhow, I see your comment that far too high in voltage is not good. So I take that into account.
Here are capacitors of 1000uF and 35mm diameter I found: click link
Questions
Thnx Martin!
Ernst
If an aluminium electroytic capacitor isn't used up close to its voltage rating, even if only occasionally, it will not be excited, and it will die fast.Popular speaking, you can say that it "dies from boredom".
I would suggest fitting a 50V or 63V. Nothing higher than that.Something like this:https://nl.rs-online.com/web/p/aluminium-capacitors/1636660
Also thanks for explaining why too high voltage doesn't work well.I'll follow your advice.
One more question Martin, just to be sure.
I have just detached the original capacitor. One pin has one red wire connected. The other pin has 7 black wires connected. And on the side of the original capacitor, text says 'RED POS'. Normally I would say, sure where the red wire goes is the positive. But the pin with the black wires has a red dot. (see pictures)
So my question now is what to follow:
Hope to have your advise.
Red tag is positive - for the capacitor!The Beomaster as a whole, has positive ground. Hence the "confusion".Just make sure you get the new cap polarized the same way the original was and everything will be fine.If in doubt put a DC voltmeter across the cap and with the variac slowly bring up a little mains, just enough to see that the positive voltage is indeed found at the caps positive tag (which is connected to ground in the Beomaster).
So this means that the black wires are connected to the positive pin of the capacitor?