[Drake] AM Filter Advice for TR-7

[Jim DiMauro]

Hi All:

I have a TR-7 that I'd like to use on AM every so often.  The trouble is
that the radio doesn't have an AM filter.  A previous owner had installed
the resistor mod that's supposed to act like an AM filter, but the result is
far too wide to be useful.  For example, if I'm listening to a QSO on 7290,
I can hear CHU on 7335.  Now that's wide!

I'm looking for recommendations on AM filters, specifically which ones
perform well.  Should I look for an original Network Sciences SL-6000 that
Drake supplied, or are the better options out there like Sherwood and Kiwa?
All input will be appreciated.

Thanx & 73,
Jim
WA2MER