[R-390] IF Filter Disassembly

[Flowertime01 at wmconnect.com]

Mike,

Yes, I remember how to get an R390/A mechanical filter apart.
I hope that is your question.

You can unsolder the leads to the cylinder and unbolt the mechanical filter 
from
the chassis. Watch for some more mail and the web page with the photos.

Once you have the filter out of the chassis, you hang the filter by its 
chassis mount
tabs and bolt holes from the ceiling (or a tree). You tie a long lead to the 
electrical connection tabs on one end. 

Obtain suitable safety equipment and a letter from your mother or significant 
other to proceed from here. I am not responsible when you burn your self.

You heat both ends of the cylinder sleeve to melt the solder. 
You pull on the long wire you attached.
When it gets hot enough on both ends of the cylinder to melt solder,
the guts will slide out of the cylinder.

You can preheat and solder suck some of the solder out of the way first.

On a good day this works well.
Just understand you are working down hill in a gravity well with molten 
solder above your arm and hand while the other hand is busy with a flaming torch.

Long sleeves, good gloves, and safety glasses are all in order.

A small torch works better than a big torch.
But any torch works better than a solder iron as it will get the whole mass 
up to the critical temperature much neater than an electric iron.

The guts clean up and mostly can be repaired.
Most common failure is a broken wire inside the filter.

Roger AI4NI