It might be possible to "stagger tune" the IF stages to increase bandwidth. Use of a sweep generator (or a manually swept signal generator) will let you know how you are doing when trying this. As a general rule, you can trade gain and selectivity for increased bandwidth. You might be able to get as much as a doubling of the IF bandwidth by this method.
Another approach might be to try overcoupling one or more of the i.f. transformers. This might be accomplished by physically moving the primary and secondary coils closer to each other, if their mechanical configuration permits. Overcoupled tuned circuits tend to have a broader bandwidth with a dip in the middle of the passband. Combine this with a more loosely coupled stage with a narrower peak that coincides with the dip, and the sum result would be a broader and flatter passband with steeper skirts.
Don k4kyv
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