Technical Capacitor questions for my radio.

Hey fellas, just finished re-capping most of my amp/speaker section of the radio for my 56 Pontiac Starchief. All I have left is the three section capacitor. I believe it is can type but those can be expensive. Anyone know if the can is able to be opened and capacitors replaced with new ones individually? If not, am I able to use three regular ones in its place underneath the can capacitor?
Secondly, the schematic calls for 20 ufd caps inside the can. The closest I've been able to find is 22 ufd. Will this work or would I be better off with two 10 ufd caps in parallel?
Thanks for any info you guys can provide! I take a lot of pride in doing everything myself and enjoy learning every part as I go! Hope this isn't too far off topic.
Johnny

 

22 should work fine, and you can use individual caps to replace the sections of the can. They're just filters...the exact value is not critical.

 

Most old caps were + or - 10% anyway. 22uf will be fine.

 

Just make sure you use at least 20V parts and pay attention to the polarity. 50V parts would be better.

 

Since you have a radio that uses a ******** to bump the 12v up to 300-400v, I would think you better find caps with the same voltage rating as the can you are replacing. My guess you will need at least 400V caps.

 

Pretty sure it calls for 400 V in the schematic! Gotta look again before I order, but I am aware of the high voltage rating required.
As far as polarity, how do I tell which leg is which? Been a long time since I had that in school!

 

There should be some shapes on the bottom of the can that relate to the values and ratings on the side of the can. Each leg is a 'positive' with all section negative leads tied together and to the radio ch***is. Hope this helps, I can having a hard time putting it into words.