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Capacitor Tolerance with Negative Tolerance Only
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TinkerGDS:
I am replacing the capacitors on a Revox B261 Tuner.  I have the service manual and started making a list of all of the electrolytics.  I thought I understood capacitor tolerance: +-20%, -20% +80%, but most of the ones in the service manual are rated at -10% only.  I don't understand what that means.  Is that a shortcut for -10%, + 20%.  I expected to see some information in the service manual like, all values represented are 20% unless otherwise noted, or something to that affect.  So I'm not sure if there's a standard for parts and value listings, or if there really is such a capacitor tolerance as -10%.
danadak:
Different Cap technologies have different tolerance specs. They even have parts whose C rating is
very sensitive to the V across them.

Are you just replacing electrolytics ?


http://www.kemet.com/Lists/TechnicalArticles/Attachments/6/What%20is%20a%20Capacitor.pdf

http://www1.eere.energy.gov/solar/pdfs/8_tuttle.pdf


Regards, Dana.
TinkerGDS:
Those are two great documents.  I've saved them in my reference library.

Yes, I am just replacing the electrolytics.  I am not trying to make the tuner "better", I just want to bring it back to its original state when it was new back in 1982.
Cliff Matthews:
Ditto here, I love this place! Thanks Dana.
Kalvin:

--- Quote from: TinkerGDS on November 11, 2016, 01:32:04 pm ---I am replacing the capacitors on a Revox B261 Tuner.  I have the service manual and started making a list of all of the electrolytics.  I thought I understood capacitor tolerance: +-20%, -20% +80%, but most of the ones in the service manual are rated at -10% only.  I don't understand what that means.  Is that a shortcut for -10%, + 20%.  I expected to see some information in the service manual like, all values represented are 20% unless otherwise noted, or something to that affect.  So I'm not sure if there's a standard for parts and value listings, or if there really is such a capacitor tolerance as -10%.

--- End quote ---

My guess is the -10% notation means that the capacitance may be 10% less the nominal without compromising the sound quality, but it doesn't matter if the capacitance is higher than the nominal (+10% or %20, for example).
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