[sdiy] old capacitor ID

[Scott]

Hi, I'm working on fixing an old 50's amp, and want to replace the
electrolytic capacitors.  A few are obvious, but then there are a few
more that have a line marking one side, but I just read something about
how they might not really be polarized.  
Could you look at these pics and let me know if you know what kind of
caps these are, and if they are likely to need replacing? 

http://www.sdiy.org/wicked1/oldcap1.jpg
http://www.sdiy.org/wicked1/oldcap2.jpg

Thanks!