The values of components, such as capacitors and resistors, are typically identified with markings or symbols right on the component.
You say: "Most of the components are old and not working." The caps, particulary the electrolytic filter caps, should probably be replaced, and maybe some of the resistors have drifted up out of tolerance, but otherwise, I'd expect that most of the components WOULD be working - e.g., coils, switches, most of the tubes, transformers, speaker, etc. Don't be too hasty.
Except for removing the chassis from the cabinet, I would not "take the radios apart." The first order of business, in my opinion, after replaceing the filter caps, is to start troubleshooting and to get the radio working after a fashion.
There is a schematic on this site in Resources under Canadian RCA for the T6-2 at http://www.nostalgiaair.org/Resources/085/M0030085.htm
Radiodoc
Feel free to email me if you want to confirm a part value.
Ed.
Thomas