i have voltage all around my tube sockets and such yet my tubes arent lighting up, i know that th tubes are good also because i just had them in a different amp. I also do not have any sound coming out, i do have volatges in different places in the amp.
You need to test the filament, heater, and grid voltages. If these are all correct and it's biased then get it checked out by a professional.
Ill just say my generic response to this situation lol: I would get it checked out by a pro. It only costs just a few bones and its totally worth it to have your amp get a good oil change and tune up.