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The most likely parts in electronics of that era is the electrolytic capacitors.
That is why the best thing to do is assume they are bad before applying power.
Semiconductors are easily damaged by excessive current or voltage. A tube can withstand an overload for a few seconds but semiconductors will die in an instant, often without making a sound or without any smoke.
Of course any part can go bad. Many times TVs or radios are retired because something went bad and the owner doesn't want to bother getting it fixed.
Yes, stay away from the IF and Tuner since you don't have the test equipment for readjusting them. An exception might be carefully cleaning the contacts in the tuner.
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