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B+ is the main low voltage power for the set (by low voltage i mean 200-400volts). a digital multimeter set to DC volts will tell you if its what it should be. You will need a schematic to know what it should be.
the can caps are going to include the filter caps, prob 350v 40uf or something like that. If you have a multimeter you can get an idea if they are at least not shorted by checking the resistance from the + term to the chassis, it will start off very low resistance but should quickly rise to around 10k ohms (all this done with the the set unpluged). If it does this then its prob ok to try a power up.
Your prob not going to hurt anything if you just plug it in and see if all the tubes light up. Just a wild guess, a weak 5U4 would keep it from working. If you can get your hands on a tube tester I would check that one.
if you get sound from the speaker then there is a good chance the TV B+ is ok.
If the CRT does not light up, then you may have no high voltage. There are special probs for measuring this at the CRT anode cap, beware the CRT anode has around 20kv when working, and the CRT can store a high voltage for a while even after the set is turned off.
If you are new to electronic work remember that there are high voltages that can kill and very high voltages that can knock you senseless, so if you are a complete newb you may want to see if someone can help you check it over.
Not knowing your skill level makes it hard to say but you may want to do some more reading before tackling a TV or any line current powered devise.
The main concern is the high current that is available at the power plug, you get tangle up with that and its not good.
you may want to try checking of some you tube clips on checking out a TV, while there is a TON of garbage on you tube, there are a few informational clips as well.
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