I have come across some old capacitors and would like to use them if possible, but I'm not sure how to determine their values from the markings on the sides. I understand there is some convention to these markings, but have not been able to decipher it. Can anyone tell me the values of these three capacitors, I would appreciate if someone could break out what the various parts of the names indicate? I believe they are all ceramic.
1) Good sized disk. Labeled E N750 10J.
2) Square. Labeled CK05 BX 104K 50V K 8514. This one I could kind of decifer as 10^4=100000pF=100nF +/- 10%, max input voltage of 50V, not sure if the other numbers mean anything.
3) Tiny blue one. Labeled 104 25E 8720. I'm guessing the 104 also means 100000pf.
Also, are any issues expected when using old ceramic capacitors?