"When something can go wrong it will go wrong, and it will go wrong at the worst possible moment."

Or even better:
"The more complex the system, the more likely it is that something will go wrong - and when it does, it will have worse consequences."

My disappointment is immeasurable, I did everything I could not to mess anything up,
I added a 50:50 UnUn to the two cascades of the class A RF amplifier and a band pass filter to the input, I purposefully set the resistor values so that the transistors operate at half power
(36 instead of the maximum 120 W for two cascades).
and still somehow I screwed up.

And the worst part is that I don't know at what point I fucked up, which means it is impossible to fix without special tools, so now I just hope for a miracle that it will miraculously start working.