Ignoramus22732 wrote:

Are they 4.1 farad each or they are 4.1 millifarad? They are rated for
300V. Are there PCB in them?



The historical aspect of this just HAS to be remembered.

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Only metric prefixes for 10+6 or more have an upper-case abbreviation (e.g.,
M = 10+6, G = 10+9, etc.). In particular, note that the prefix m indicates
10-3 and M indicates 10+6. The difference between an upper-case M and a
lower-case m is nine orders of magnitude! One should be warned that American
manufacturers of capacitors often use "mF" or "MF" to indicate microfarads,
a practice that is both incorrect and misleading.

http://www.rbs0.com/tw.htm
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mike