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If they're not shorted try measuring their capacitance. They're probably really leaky, but hopefully still good enough to find the capacitance.
I don't think the values are critical, except for the tone control. You could try a 0.002uF for that one and see if you like the tone range.
I see that oldradioparts.com has catalogs from Wholsesale Radio Supply. I don't know if they would be of any help.
The choke could be a few henry. But, the field coil usually also has a significant series resistance. You might need to get that approximately correct. I'm also puzzled by the line going to the speaker, unless it's meant as some sort of hum bucker. I'm guessing that it's really just a jumper on the speaker plug to keep you from powering up the amp without a speaker.
John
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