I'm still searching for another fast and simple solution to push my tuner to
4 o 5 Khz.
What do you think about modifing the local oscillator (whe you found it in
the pcb)? Due to high frequencies, it is probably a simple air coil. So I
can insert ferrite rod inside it to rise up inductance (and lower the
freq)... or i can cut off a spire....
Or modifing the capacitance of the tuning capacitor? I can add another cap
in parallel with it, exploing that parallel caps drop down the
capacitance...