Hi Giuseppe, I have two questions.
First, the C30 (30pF) capacitor is not installed. Did you remove it?
Also, I see that at L4 instead of the T37-2 (red) toroid you used a T37-6 (yellow),
I was wondering if you first tried the designed parts in these two locations but decided to try something different.
I have the kit finished to the point of beginning alignment and adjusting the windings for RF power out. I hope I can reproduce your results. This is a real learning experience.
Regards, John