Audio Filter for Ten-Tec Argonaut?

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Hello, Everyone. I'm in the process of getting back on the air after about
15 years. My immediate problem is finding a CW audio filter for my Argonaut
509. I had a nice little active filter I built a long time ago, but it has
gotten lost in the shuffle of too many moves since then.

Can anyone recommend a nice, sharp, CW filter that would be compatible with
the Argonaut? I am making some effort to locate one of the old Ten-Tec 208
CW filters, but I'm not too optimistic about finding one. In any event, I
wouldn't mind adding a little modern technology to the Argonaut if there's
something out there.

Any advice would be appreciated.

Looking forward to QRP'ing again,

Jon Ayscue, KC3OU

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