I know I should know this but I expected there must be a difference in those capacitor ratings. Is there no performance difference? Just physical size?

u is the 'transliteration' of the Greek letter "mu", which is the abbreviation for 'micro'. "m" for reasons I never understood, was sometimes used to sub for "mu" to indicate micro, even though it is the abbreviation for "milli" (i.e., 10^-3).

F is Farad, so, yes, uF is microfarad.

uuF, or mmF, of course, is micro-microfarad, or picofarad (pF); pico = 10^-12. "micro-mikes", in the olden days...

Yes, μf is the same as mfd (MicroFaraD). And yes, there is a significant size difference between old and new electrolytic caps. There are some pictures floating around showing the difference in size between old and new caps. Check out this thread:

http://audiokarma.org/forums/showthread.php?t=63359

Over in Europe, they also like to use nF for nanoFarad. 10^-9, or 1000pF or 0.001 uF. Another thing they like to do there, and I like as well, is that they'll use the "n" or the "u" in place of a decimal point. 4n7 = 4700pF. Decimal points tend to get lost, which is also why most everyone uses a leading 0 in front of things like 0.0047uF

Thanks for showing a true "mu", in your post, Dr! I was too lazy...

mhardy, delihaus 'n I are gonna get together on the 10th in Boston, are you in? Deli 'n I have med appts at the same place on the 10th, maybe do lunch or something?

I'll check the calendar & PM youse guys.

Very good!

u is the 'transliteration' of the Greek letter "mu", which is the abbreviation for 'micro'.

See the Greek letter "M" in the Greek alphabet:

http://www.mathekiste.de/griechischesalphabet.htm

u for Greek "my" is not correct, but it is similar to "X" for Greek "Chi", while the corresponding Greek letter for Latin "X" is "Xi".

Eckhard

That is correct, that's why I said "transliteration" in quotes (inverted commas, if you will). Greek "mu" is the Latin "m", but it looks a bit like the Latin "u", so we tend to use u's for mu's. :-)

aren't "mu's" what you get from a Holstein?

aren't "mu's" what you get from a Holstein?
Aah, we have "mu's" too in Lower Saxony here :yes: