[NostalgiaRadioTime]

I can't speak for your model 43, but I've had trouble with rotor & stator plates touching on tuning capacitors in the past, causing the same symptoms you're describing. I tried to get an even gap on each side once they are in the closed condition, using a set of narrow width feeler gauges to check the spacing. In one case, I used a set of tiny jewelers files or some fine grit, stiff backed sandpaper to open the stubborn gap when there was corrosion causing the crackling.