Pennine Ranger Project

[boater sam]

Thanks Mike, I have looked at everything else, the cores are unmoved, I cannot establish the frequency range with my equipment, I would not know how to with 2 coupled coils either. Short & medium waves are fine, sensitive and tracking well, Valve voltages/currents are roughly correct, all have been substituted. Components that were suspect have been changed, small value caps seem OK, resistors are all 20% and in tolerance.
Why would a broken pot increase the Q?

Lawrence, I thought of just replacing the coil/pot arrangement but have nothing suitable to hand. It would need to be a pair of coupled coils as per the original because  of the switching. Which Denco?