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I agree with Doug on this. I have ran into bad can caps, of course. However, I've ran in to a great deal that were good. Since most of them are a pain in the butt to change, I usually leave them alone unless they are defective. I see far more bad cardboard tubular electrolytics than I do the can type. In fact, most of the multi-section carboard caps I find in tube radios are shot. I have seen a lot of bad caps in newer equipment. I think a lot of that is due to the fact that they are cheap parts to begin with. I will say that if you run into a can cap with one bad section, replcace all the sections. I can remember two solid state sets that I fixed where only one section was bad and a week or two later, the other section died. That's when I started changing the entire can even if one section was bad. Also, it's not a good idea to leave the old can in circuit.
Now, the old paper caps get changed in radios I fix regardless. I had a friend that was so tight that he would not change a paper cap in a radio unless it was totally shot. His theory was that if the radio worked; then, why bother. Really, those caps are cheap enough and it's worth it to me just knowing that the safety factor of the radio will be better and knowing that it will be more reliable.
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