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Given the age of this amp, I highly suggest you get new caps for it. Caps are like batteries. They get old, they get weak then they short out and blow the crap out of tubes and transformers. New caps insure clean DC voltage and power to spare. Most amps can have between 2~6 of them and most cost less then $5 each. Putting them in is usually a simple soldering job that only takes a few minutes once you're in there.
The power tubes should be purchased as a matched set. This way the power each produce will be equal. Many amps also need to have the power tubes biased.
Given the fact you need new tubes, switch, lamp and possibly new caps if they haven't been done, you may want to buy the parts and let a pro do the work. Doing a good soldering job and biasing the parts isn't something an amateur may know how to do well. In low voltage situations, like guitar pickups and pots, you aren't going to blow anything out with a short or cold solder joints. On a high voltage tube amp there is NO room for error and you only get one chance to get the job done right, I especially advise this in your case unless you have th soldering and technical experience to do the job right or know someone who can help.