Do you have a separate preamp (sans amp or similar) that you can plug into the effects return socket? That will tell you if your power amp stage is working,and it’s just a bad / broken connection between the pre and the power stage.
not sure if the di out on there is pre or post eq, if you can try it with another valve (12ax7) that would be the first thing I’d do.
Loud, sweaty & lots of fun. Local gig last night at a venue we play semi-regularly, so lots of connection with the audience. Dancing from the word go, which even the owner was impressed with. All in all a good do!!
Double bass sounds can be had by muting the strings with the edge of your picking hand and plucking with your thumb - helps if you roll the tone off too!!