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maurycy 30th April 2012 06:43 PM

Ceramic capacitor voltage?
 
I need to replace few ceramic capacitors on the power amp board. They have markings like "0.1uF KCK" (see picture). What's the voltage I should pick for the replacement cap? Checking Mouser.com website it looks like 0.1uF is listed from 50V to 2KV. Service manual for the amp just lists the capacitance value and not voltage for the ceramic capacitors.

Thanks.

firechief 30th April 2012 07:41 PM

Do you have the schematic in digital form? If you post it, we could be sure. Or measure the voltage on both sides of the cap. Also google returns some good hints. When in doubt a higher voltage rating is not a problem. Tube or solid state? Model?

maurycy 30th April 2012 07:49 PM

Thanks for replying. The capacitors are on the power amp board in Luxman L-85V solid state amplifier. The boards are shot so I am doing a full rebuild. That's why I can't measure the voltages.

Here is a link to the power amp section: PB-1037

Full schematic can be found here: full schematic

firechief 30th April 2012 08:03 PM

OK I see an electrolydic in that power section that is rated at 100V so you would be safe with something like 250V but check the physical size. As the voltage goes up so does the size.

maurycy 30th April 2012 08:08 PM

Great. I will check the sizes when ordering replacement caps. Difference in price between 50V and 250V is not that big. Well, actually it is about 3x more but we are talking cents here and I only need maybe 10 of those capacitors. :-)

Thanks for your help.


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