Below is the graph showing the characteristics in electrolytic capacitors. Several points to be had, which

you already know, but I thought some proof would be helpful. (The graphs are from the article "Picking Capacitors"

by Walter Jung and Richard Marsh.)

The first characteristics are the low frequencies at which various (ufd) electrolytic capacitors become

non linear, and inductive. With newer, high frequency electrolytic capacitors, I am sure the non linearities will occur

at higher frequencies, although the quality will still be lower than films.

The second is that quality varies vs manufacturer.

Third, the bigger brand names does not necessarily mean better specifications. Any input is welcome.

Fourth, notice the difference between electrolytic capacitors and film capacitors by comparing the different graphs.

Compare the frequencies of the two graphs (on the X-axis).

Cheers

steve