Your Model T should drown the guitars with earth (and window) shattering bass. Seriously, if the amp has never been retubed and it has seen a good amount of play time, new tubes will bring it to life. This amp puts out about 120 watts of bone crunching power when it is at peak. I suggest retubing it all the way. Go to eurotubes.com and purchase a quad of matched KT88s and three ECC83S (12ax7), current balanced or triode matched. It will cost you about $175.00 for the tubes with shipping. You are going to need to have the bias set. As long as you are not getting any power supply hum, your power supply filter caps are probably ok. Age and use can take their toll on filter caps.
The Model T is worth restoring at any rate. They generally go for $800 to a $1,000 on eBay. To me, they sit at the top of the list for bass tube amps!
Regards,
Chuck