[Boatanchors] W3NQN Passive Audio Filters

[whitebear1122 at comcast.net]

Have any of you guys used the W3NQN passive LC audio filter?  While his
early bandpass design used ten 88 mHY torroids, he has a later design that
used six.  I have been unable to find that design.  Would you happen to
know?   I would like to add this passive cw filter to my HBR-13 receiver.
The HBR bandwidth is a bit wide for my liking, even with the ARC5 IF
transformer slug distances at maximum.   Plus there is some hiss that I
would be delighted to eliminate.   Thanks. 73, Scott WA9WFA