[R-390] Filter repair

[quartz55]

I've gotten back to working on the filters today. Got the 4K filter ready to install back in the tube.  I ended up gluing the foam on the copper cups, I think I will also glue it to the gasket material, but it looks if the dimensions are right, things should be tight in the tube.  I shaved the outer parts of the foam to conform to the size of the gasket material in the tube, so the gasket with the filter assembly in it is a light press fit into the metal tube. I've lost the 57K resistor, it was here a minute ago. Funny how things can disappear off a tablet. The ground strap also fell off the resonator, I can only solder it back on and see what happens. I drilled and tapped a 6-32 hole in the bottom end and cut off a screw. I think I'm going to seal it with RTV instead of Locktite. You can see in the pic, a 6-32 is about as small as you can go to get the inert air bottle straw into it and have space around so the old air can escape.  I'm thinking since this stuff is lighter than air, I should hold the hole down and insert the tube from the bottom to let the air escape down and out although it may not matter.

Now if I can solder those tiny wires on the header pins, I'll wrap them so they don't just fall off when I solder the end caps on, although I may just tack the end caps until I test the thing. As Bob says, I'll put a little glue on the wires where I solder them to hopefully keep them from stressing off.  May help with the heat too.

http://i251.photobucket.com/albums/gg287/DogTi/R390A/filter4k_zps7bf4c9ec.jpg