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is a slow moving hum bar getting into the pic?
On the NOS, I too would not use them, at least not without a check out with a good caps tester. I often have no problems with the can cap in mid 60's sets. I dont know if its a storage/usage/pure luck but most of the time they are fine. I check them against new caps, often leakage is no worse than new ones. I do recommend a slow power up on the 1st use.
I was recapping a old set last week, replacing some papers, I always test what comes out (often leaky, but value is still determinalble) leave the cap tester at the value, double check to see if its right, THEN get a new cap and put it on the tester with out moving the knob that nulls the eye tube. The new cap should be close to the old, this saves me putting a factor of 10 diffrent cap due to my reading it wrong. After confirming the value I do a leak test (on the new cap) for the 1st time I had a brand new cap that was very leaky, would not open the eye at all even at much lower voltage. I grabbed another and it was fine (just making sure my cap tester had not pooped out).
Moral of the story is double check values going in, and test new parts going in.
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