[Milsurplus] Narrow AM mech filter ?

[Hubert Miller]

Speaking of mechanical filters, what would be the narrowest one for AM 
voice and CW working?
As specifically, in the TR-9 trans-receiver. I think the filter in it is 
wider than it has to be. There is
only one, one-size- fits-all  filter in the set.
tnx -
Hue Miller
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