Hello John, I would second what Gary said as to ascertaining the resonant frequency of the IF transformers.
If after doing those checks you find that they are out of spec and the slugs are unadjustable at the end of the day then one option pending lack of good replacements is to convert the IF's to capacitor tuned instead of slug tuned, that would depend if there is room to fit compression trimmers and a means of making access to adjust them, I have done this in the past with some success but bear in mind the capacitor trimmer screw will more than likely be at HT potential on the primary side and the Q at resonance might not be up to originall spec if the settings of the original slugs were tweeked a long way off.
Lawrence.
If after doing those checks you find that they are out of spec and the slugs are unadjustable at the end of the day then one option pending lack of good replacements is to convert the IF's to capacitor tuned instead of slug tuned, that would depend if there is room to fit compression trimmers and a means of making access to adjust them, I have done this in the past with some success but bear in mind the capacitor trimmer screw will more than likely be at HT potential on the primary side and the Q at resonance might not be up to originall spec if the settings of the original slugs were tweeked a long way off.
Lawrence.
