"miken" wrote in message
...
I've got a number of small 10.7 Mhx FM bandwidth crystal filters I
want to dismantle to recover the crystals for making a narrower
bandwidth filter.

What is the best way to open the can? I have a small butane torch
which I could use to try and melt the solder the joint around the
perimeter of the base of the can, but I don't want to harm the
crystals.

Does anyone have any experience of this, and would I perhaps be better
to hack the end off the can, and get into it that way.

Thanks de miken, zl1bnb

Miken

Some of those FM IF filters used cascaded monolythic two-pole filters
with small matching capacitors between the sections. It may not be
a lattice filter like I suspect you are anticipating.

I've opened those cans by heating the seam with a large iron, just enough
to get a small screw blade started to gentle prying the seam apart.

Regards

Peter