Lrl from Italy

[FrancoItaly]

Changing C9 is not needed, it serves to connect the filter to the TR2 base and its impedance to the frequency of the filter is very low, negligible. C10 determines the filter resonance frequency together with L1, put a variable capacitor (10/47pf) in place. If you do not put C10, however, the parasitic capacity of the basic/emitting junction of TR2 (about 7pf) remains.