If Albert is happy for me to share i will post them up. the files were the originals converted from x1 to 274x with a little tidying up, hench the mistake on the pcb. it is fixed now on the gerbers.

Wher you get this 19khz filter?  do you heve datasheat?
I ask for gerber if is possible get to start meke my drawing with gyrator-based elliptical filter insteadd  coil inductor hard to find it...

It's much easier to start from your work than from scratch. I'm ready to trade. I hope you understands me.