Anthology II

No need the SB26CDC is a fine tweeter and at high crossover frequency will play effortlessly all day, all night.

Of course. If you want to change the directivity a ribbon will certainly do that. But that is not the original design, and you couldn’t just swap out the tweeter without changing the XO.
 
chopthebass,

You can parallel a 6.8uF cap and a 2.0uF cap to 8.8 uF.

For an inductor you can buy a 7.5mH inductor and take a few turns off to make it a 7.0mH inductor - however you will need an inductance measuring meter or a DATS device to measure the inductance accurately so that you get to the correct value.

Another approach is use two inductors in series e.g. 6.8mH and 0.2mH to get to 7.0mH, but for that please make sure that you put some distance between the coils and do not have the cores on the same axis.
 
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