It would be a good idea to check the ohmage from B+ to ground before you apply power. With no power on, and the tubes removed, I would guess the proper ohmage would be a couple thousand Ohms. Also make sure the caps are discharged before the test.
I've smoked a lot of projects in my 40 years of building things. =-} Haste makes waste.
I've smoked a lot of projects in my 40 years of building things. =-} Haste makes waste.