[old_tv_nut]

L9 may be an IF choke, or it may be a peaking coil to match the detector to the grid capacitance, I don't know. Either way, it is not needed with the low output impedance of your amplifier. Plus, since your amplifier is a feedback circuit, hanging odd impedances on the output could pose a slight risk of high frequency oscillations. So, remove L9 and go through a coupling cap and then directly to G1, I think.