On Sun, 05 Aug 2007 03:40:44 +0000, Michael Black wrote:

yea right ) writes:
Came across a jar of old crystals at a garage sale today. I saved them
from being tossed into the garbage. The home owner says they were in
the house when they moved in and were about to toss it.

I'm going to take them to a swap meet next weekend but there is one item
in the bunch that looks unique. It's a hallicrafter 455Khz crystal
filter in a holder. Looks like one of the crystals except the top is
rounded.

http://www.vambo.org/tmp/OldXstals.jpg

I suspect whomever gets the crystals would not have a use for the filter
and it would site on someones shelf. So, I would like to see if anybody
here has a use for it before I take it to the ham fest.


Huh?

Up until the mid to late fifties, the only crystal filters you'd see in
equipment consisted of a single crystal. Even after mechanical filters
came along, and even after crystal lattice filters made it into ham
equipment, there were still those filters made with single crystals.

Chances are pretty good that whateve you have, it's merely a crystal.

Michael VE2BVW

It says filter. Here is a much better picture..

http://www.vambo.org/tmp/Hallicraftt...stalFilter.jpg