The AOR TDF-370 is now out of production but had a binaural filter. The review in the September 2001 QST said that the CW Stereo function made a huge difference.
Take a look at
usascan.com/files/tdf370.html
"Stereo" CW Reception: The built-in band pass filter has independent outputs for the left and right channels, allowing independent bandwidth settings heard through the included stereo headphones."
There was also an article by Robert Sommer, N4UU in the Feb 1986 QST, page 15 on constructing a binaural filter. It included a circuit board pattern.
73
Zack
N8FNR
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