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.05uf cap

Posted: Sun May 17, 2015 5:19 pm
by kylealers
Hey there I'm working on a building a valve pre amp I know this might be a stupid question I'm a beginner. Would It be possible to use five .01 uf capacitors instead of one .05uf I'm having a hard time finding the .05 cap

Re: .05uf cap

Posted: Mon May 18, 2015 4:09 pm
by Pauldf
You could if you want to as 5 x 0.01uf capacitors in parallel will add up to 0.05uf. It will be a bit messy though.
As uf (microfarad) is 10^-6 and nf (nanofarad) is 10^-9, 0.05uf = 50nf. You may have more fun searching for 50 nf , google says they are plentiful.

Re: .05uf cap

Posted: Tue May 19, 2015 9:49 pm
by Richard
BTW 0.05 uf is not a "preferred value" (in a manufacturing series) and you might find the nearest preferred value, 0.047uf to be more easily available. It will work just as well. Since you are building a valve preamp please take care and check that the voltage rating of the capacitor is greater than the actual working voltage the capacitor will experience. Allow a generous margin of safety - say 50%, because in some circumstances the HT voltage at switch on will be higher than you might expect until the valves warm up and start to draw current. Difficult to be more detailed because it all depends on the precise circuitry, and where in the circuit the capacitors are.