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More likely than not, the first few stages are out of tune, be it from age, or from someone messing with it, for some reason or another, it can't pass a signal, and nothing short of someone with an alignment setup can get it back to working the way it should again.
You could try the steps that Squirrel boy mentioned, like on the top of this page, unhooking the primary of L4 to feed in the subber direct, this can help find what is out of tune, however, trying to tune without the right equipment is pretty much impossible, and you pretty much end up making it worse if you try.
At this point you have pretty much confirmed that you do indeed have an IF problem, and the best way forward is to rig for direct A/V input until you can find someone with the correct equipment and knowledge near you to align it, the chances of there being a fault in the IF is low, but there may be, but when alignment is attempted with the right equipment, any faults will be quickly found.
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