[R-390] Filters

[quartz55]

Here's what I'm thinking about the magnetostrictive wire.  Needs to be welded on close to the contact point.  Maybe with less uF and more voltage, need to experiment in this department.  I'm not sure what the wire size is, probably something less than #40, which means it's going to be real hard to deal with.  I think I could come up with another sled/flea clip arrangement that would reach into the copper cup and weld it on (capacitive discharge) close  or even right on the resonator.  I don't think it's worth trying to unsolder the copper cup off the last resonator.  I'm willing to play with it, but the only wire I find (US) is #34 nickel for about $8.  It might be worth playing with unless I can come up with a 4K filter with only bad bobbins.