[Platefire]

Yeah like Johnny said, always check a elliminate the simple things first. The fact that your tubes are lighting up means your Power transformer is working and heater voltage is getting to tubes. If the 6L6 get really hot that means they are also getting the high voltage DC power from filter caps that is controlled by the stanby switch. If you have your stanby switch on, you will get nothing until you dis-engage the stanby---off course you knew that.
Yes the amp can be damaged if you run it with all power up and the speaker is somehow disconnected. Tube amps need a speaker load to keep from self destructing. That's why it's important to be sure about your speaker connection. Solid State amps no problem.
A multi meter is a cool tool to have when you fool with amps. You can get a cheap one from wal warts for about $10 -$15---where you could do Ohm test on speaker leads, guitar cables---amp circuits and you could test your speaker cables to know for sure they are OK. You could possibly check the speaker by hooking it up to another amp or hooking another extra speaker.
BTW---how far was that tube cocked over that you straighten up???? I would recomend pulling that tube and visually inspecting it for any damage.
Platefire