[R-390] Filter repair

[quartz55]

OK, I've got my #34 nickel wire today and it's very magnetic, I couldn't find any #40 and I'm not sure I could handle it anyhow.  I thought about building up a higher voltage circuit to try welding with higher voltage and much lower cap value, but after trying a few 20uF 700V caps at 150V, the voltage just doesn't stay on them for any time at all, so I went back and used a 13,500uF at 10 volts and it seems to weld the wire on a resonator disk I took out of another filter pretty good.  I can't pull it off the resonator with my finger pressure.  I also held the wire close to the end if the wire with the clip, like 1/16" or less.  That keeps it from bending too while pressing it on the disk.  So now I've got to build up a sled arangement to try to weld the wire on my old 4K filter by pushing the wire and clip way into the copper cup and not shorting anything.  Here's my latest attempt, I didn't even try to center it.

http://i251.photobucket.com/albums/gg287/DogTi/R390A/filterwireweld34_zps5c0125c5.jpg

A couple of nice guys also sent me some old broken filters to play with, and a couple of them were the R390A 4K filters.  One of the old shiny ones and one of the newer buff type.  One has an open winding and the other measures good with the ohmeter, but I'll try it in my new filter test circuit.  Maybe I can get one or 2 good 4K filters out of the 3 bad ones I have.

I also got a headband magnifier, my lighted desk magnifier was just not strong enough.  I'm set to play with them again, but if it warms up and the weather is good, I have a lot of yard work to do.