[R-390] Filter repair

[quartz55]

Interesting.  The resonators in the filter are magnetic, but the ring that's on the copper cup is not magnetic.  The magnetostrictive wire is, however.

I was trying to think of a way to keep the rings lined up and spaced while soldering stuff together.

I'm thinking if there is nothing more wrong with a filter than leakage, I think I'd not pull the bobbins out of the copper cup, maybe just re-glue it in place with some modern epoxy and clean it up as good as possible.  One of the bias magnets came off the 2K filter too, so that will have to be re-glued.

The saga continues.

I used to see these R390As when I worked at USM620K, on top of Teufelsberg (American name) in the Gruenewald in Berlin.  I was a Monterey Mary, German varity, MOS 058? 63-65. 78th USASASOU, Graduated Army Language School in Oct 63.  Went straight to Berlin.

http://i251.photobucket.com/albums/gg287/DogTi/ocup.jpg