[old_tv_nut]

Each coil connected through capacitors or otherwise to the tube circuits is a resonant coil. Saying that they are stagger-tuned coils only means that each one is tuned to a different frequency instead of all to the the same frequency (which is called synchronous tuning).

The coils that are connected to nothing except a single capacitor and nothing else are the trap circuits. These trap circuits can be called magnetically coupled or transformer coupled if you wish.