[Elecraft] K3 Audio Low Pass Filter

[David and Dianne on Comcast]

Hi All,

Earlier today Mike Scott wrote:

"I just completed an installation of the K3 audio low pass filter board, 
the one Lyle put out to individuals who wanted to try it."

Can anyone give me a referral to the original thread on this K3 Audio 
Low Pass Filter.  It must have gotten past me when originally posted by
Lyle.

I checked the reflector archives back to November 2008 and couldn't find it.

Thanks,

73 de N1LQ-Dave