[Penthode]

So for the traps, you are to find the null with the core on the outer most postion. The stagger tuned stages should be in the relative position you started with. If it falls into oscillation, as I am sure others have had on the model, then tuning each stage to the correct physical (original) position should eliminate the oscillation. I have only had to resort to increasing the bias to fix stubborn cases and never having to shunt stages. But if you are not careful you may have to resort to that in order to get back where you started.