Those $1000 each capacitors are hand made with such wonderful workmanship and materials that the are marked plus or minus 20 percent tolerance! Temp range of operation? life span? vibration resistance? peak overload capacity? series inductance? Hummm not a single worthwhile engineering spec provided. All we know is that the workmanship is so lousy that they can't come up with a rational tolernance specification.
Boy are you out of touch with modern engineering!
Didn't you know that it's no longer necessary to have specs for parts? You just select them by price.
Then you test them. You throw them up in the air. If they fall back down, they're suitable.
Next, you use feng shui to determine how a specific part gets aligned on the circuit board.
Personally, I would never use these Duelund caps because they are the wrong color. That awful shade of dirty orange makes it certain that your stereo system will always sound terrible.
Blue is much nicer. A pretty sky blue that makes you think of warm spring days, birds tweeting, and your income tax return being due. What! How did that get in there?
